Bug fixes(2), some tweaks to plan calculations for freeze discharge

What's Changed

• Fix crash with iboost enabled by @springfall2008 in #836
• Update faq.md by @springfall2008 in #822
• Update apps.yaml, correct YAML indentation issues by @gcoan in #820
• Missing Solar Edge config table entry by @springfall2008 in #817
• Make discharge freeze work instead of forced export when possible, HTML plan updates for discharge by @springfall2008 in #823
• Tweaks to freeze pass to improve discharge options by @springfall2008 in #824
• Currency configuration by @springfall2008 in #825
• Improve error handling and add error flag in predbat.status by @springfall2008 in #827
• Fix to iboost gas behaviour by @springfall2008 in #828
• Don't iboost during export (discharge) periods, remove clutter from predbat.status by @springfall2008 in #832
• Change order of planning on freeze pass by @springfall2008 in #833
• Minor fix on html plan, increase range for iboost kwh setting by @springfall2008 in #834
• Fix to iboost gas behaviour by @springfall2008 in #835

Full Changelog: v7.16.4...v7.16.3