WebCam V1.3
Changes & fixes:

1. Moved back to a simpler poll of the WEB connection, which appears to be ok for
   both flash file system and uSD card system.

2. Every 'power up' the NTP server is queried to update WebMite clock. As this can
   occasionally be problematic, perhaps some additional code should be implemented.
   There are examples on thebackshed.com site for this, using ON ERROR.

3. Save to SDCard (if fitted).
   Setup the SDCard with ANY 4 GPIO pins (I chose default SPI1 pins GP12,13,14,15)
   and add to the 'OPTION' list:
     OPTION SDCARD GP13,GP14,GP15,GP12     <<<< change to suit then test
   Then in the code set uSDCard=1
   Copy "index.html" to "B:index.html"

4. Tested with 1600x1200 jpg image. Very slow to paint, but gets there!
   Whereas a 160x120 jpg image is quite fast.

5. Implemented favicon.ico in index.html and the code (to make chromium happy)

6. If you are having trouble with the full WEB page, you can test the image in
   your browser with:  <WebMite ip>/test.jpg which should show a blank page
   and the jpg image centred on screen.
