fix build on windows.

squashed commit of the following:

* graphix: import cstdlib to fix build
* graphix: use 'timeout' in windows
* makefile: add clobber option; dirtier than 'clean'
record: fix segfault? phew.

funny how I never 'saw' this one coming till dec '14.

Conflicts:
	src/record.cpp
makefile: update keeping windows 7 shell in mind
main: add message to users about missing files at first init