Add some rasclock module files to .gitignore
Move memory map data files to /var/tmp

/var/tmp will be tmpfs on the new SD image, so we're not hitting
the SD card or USB flash for these memory mapped files.
Remove leftover call to upgrade_config from config.php

When config.php was copied from about.php this was inadvertently
left in.
Add a UI page for editting the memory mapped channel blocks.