v2.3.0

• update FITS header formatting and timestamps
• use lxml for construction of indi_pylibcamera.xml
• renamed SwitchVector FRAME_TYPE(FRAMETYPE_RAW, FRAMETYPE_PROC) to CCD_CAPTURE_FORMAT(INDI_RAW, INDI_RGB)
  to better support AstroDMX
• removed "setSitchVector CCD_ABORT_EXPOSURE" after each exposure start (that did not allow CCDciel to run
  exposures in loop)
• reworked handling of CCD_ABORT_EXPOSURE
• fixed Fast Exposure