Rename obsolete INCLUDES to AM_CPPFLAGS
Use an m4 script subdirectory, fix automake init and two macro names.
Remove autotools-related files that will get installed by autoreconf -i.
removed autogen.sh

 - no longer applicable: use autoreconf -fiv
add a few more ignores
INSTALL and ltmain.sh need those leading slashes.

.dirstamp, OTOH, is to be expected in several subdirectories.
Merge pull request #38 from LibVNC/autotools-fix-revisited

Autotools fix revisited.