Revert "mnc: do not use symlinks in win32"

This reverts commit bf7458cfccb83cdf158e4fffc51b849d66d55f28.
build: autotoolize the package.

This requires moving the directories so that their name can be used
for the final executable. Parallel make is possible.
build: properly set default plugin dir for installed package.
code: mark static anything that needs to be marked static.
add a COMPILING doc
Merge branch 'autotools'
configure.ac: use git generated version
configure.ac: use same versionning as main munin
adding explicit license to each source file