Makefile updates
Some of these are minor updates, mostly related to my wifi card workflow.
The last two are related to pull request #230 (closed):
- when compiling a module that is not yet committed to the hg source tree, the full source is included in the .mo file. According to g3gg0, this does not use extra RAM on camera, as this section is not loaded source
- uncommitted changes to ML core (src and current platform directories) are included in autoexec.bin (can be seen with a hex editor at the beginning of the file).
Use case: http://www.magiclantern.fm/forum/index.php?topic=9848.msg175779#msg175779