simple web server support for static files (#21)

* initial commit for communityWebServer kit
* can serve static files with correct headers
* support gzip Content-Encoding
* append index.html to dir url; fix buf overflow
* remove unused codes
* add comments
* refactoring; add tests for string operation
* improve wireshark sox dissector
* load 'bit32' when 'bit' module is missing
* add 'ack', 'ackMore', 'errorCode' display filter
* clean up
* several improvements/fixes
* fix compData handler bugs
* more sox filter fields support
* define fields for stream, but no implementation yet
* support configurable url prefix

* don't create StaticFileWeblet in static method '_sInit' like what
SpyWeblet does, let user to decide when to enable/disable it.

The current SpyWeblet is not possible to disable it unless uninstall the
web kit. I think we should modify it to be the same as StaticFileWeblet.
I will do it later to avoid this branch bloated.

* add webServer demo app
* use WebService logger, change log level to trace

.gitignore

@@ -16,3 +16,4 @@ sedona-*.zip
 *.log
 *.swo
 .DS_Store
+statics/*

apps/webServer.sax

@@ -0,0 +1,88 @@
+<?xml version='1.0'?>
+<sedonaApp>
+<schema>
+  <kit name="sys" />
+  <kit name="basicSchedule" />
+  <kit name="communityWebServer" />
+  <kit name="datetime" />
+  <kit name="datetimeStd" />
+  <kit name="func" />
+  <kit name="hvac" />
+  <kit name="inet" />
+  <kit name="logic" />
+  <kit name="math" />
+  <kit name="platUnix" />
+  <kit name="pstore" />
+  <kit name="sox" />
+  <kit name="timing" />
+  <kit name="types" />
+  <kit name="web" />
+</schema>
+<app>
+  <prop name="appName" val="demo"/>
+  <!-- /service -->
+  <comp name="service" id="1" type="sys::Folder">
+    <prop name="meta" val="33685505"/>
+    <!-- /service/plat -->
+    <comp name="plat" id="9" type="platUnix::UnixPlatformService">
+      <prop name="meta" val="17629185"/>
+    </comp>
+    <!-- /service/users -->
+    <comp name="users" id="3" type="sys::UserService">
+      <prop name="meta" val="16842753"/>
+      <!-- /service/users/admin -->
+      <comp name="admin" id="4" type="sys::User">
+        <prop name="cred" val="hE49ksThgAeLkWB3NUU1NWeDO54="/>
+        <prop name="perm" val="2147483647"/>
+        <prop name="prov" val="255"/>
+      </comp>
+    </comp>
+    <!-- /service/sox -->
+    <comp name="sox" id="5" type="sox::SoxService">
+      <prop name="meta" val="17104897"/>
+    </comp>
+    <!-- /service/web -->
+    <comp name="web" id="6" type="web::WebService">
+      <prop name="meta" val="17367041"/>
+      <prop name="port" val="8080"/>
+      <!-- /service/WebServ/StaticF -->
+      <comp name="StaticF" id="14" type="communityWebServer::StaticFileWeblet">
+        <prop name="meta" val="33685505"/>
+        <prop name="urlPrefix" val="doc"/>
+      </comp>
+    </comp>
+    <!-- /service/pstore -->
+    <comp name="pstore" id="11" type="pstore::PstoreService">
+      <prop name="meta" val="17956865"/>
+    </comp>
+    <!-- /service/time -->
+    <comp name="time" id="12" type="datetimeStd::DateTimeServiceStd">
+      <prop name="meta" val="18284545"/>
+      <prop name="utcOffset" val="32400"/>
+      <prop name="osUtcOffset" val="true"/>
+    </comp>
+  </comp>
+  <!-- /play -->
+  <comp name="play" id="10" type="sys::Folder">
+    <prop name="meta" val="34013185"/>
+    <!-- /play/rampA -->
+    <comp name="rampA" id="7" type="func::Ramp">
+      <prop name="meta" val="67371009"/>
+      <prop name="min" val="20.0"/>
+      <prop name="max" val="80.0"/>
+    </comp>
+    <!-- /play/rampB -->
+    <comp name="rampB" id="8" type="func::Ramp">
+      <prop name="meta" val="68288513"/>
+    </comp>
+    <!-- /play/adder -->
+    <comp name="adder" id="2" type="math::Add2">
+      <prop name="meta" val="386662401"/>
+    </comp>
+  </comp>
+</app>
+<links>
+  <link from="/play/rampA.out" to="/play/adder.in1"/>
+  <link from="/play/rampB.out" to="/play/adder.in2"/>
+</links>
+</sedonaApp>

scode/webServer.xml

@@ -0,0 +1,39 @@
+<!--
+  -  Sedona SCode manifest for a generic unix platform
+  -->
+
+<sedonaCode
+   endian="little"
+   blockSize="4"
+   refSize="4"
+   main="sys::Sys.main"
+   debug="true"
+   test="true"
+>
+
+  <!-- Kits -->
+  <depend on="sys 1.2" />
+  <depend on="sox 1.2" />
+  <depend on="inet 1.2" />
+  <depend on="web 1.2" />
+  <depend on="communityWebServer 1.2" />
+
+  <!-- Deprecated as of 1.2
+  <depend on="control 1.0" />
+  -->
+  <depend on="pstore 1.2" />
+  <depend on="datetime 1.2" />
+  <depend on="datetimeStd 1.2" />
+  <depend on="basicSchedule 1.2" />
+  <depend on="platUnix 1.2" />
+
+  <!-- These replace control kit as of 1.2 -->
+  <depend on="func 1.2"    />
+  <depend on="hvac 1.2"    />
+  <depend on="logic 1.2"   />
+  <depend on="math 1.2"    />
+  <depend on="timing 1.2"  />
+  <depend on="types 1.2"   />
+
+</sedonaCode>
+