Installing should not change source files (SPASS)

[Bart Bogaerts]

currently, when building the SPASS source files are modified.

In fact, it is autoconf that is responsible for this (see for example commit https://bitbucket.org/krr/idp/commits/0ae52cce427b9c87cb03019c550e109d3569a09e or pull request #113)

The reason for this change is that a different version of autoconf is used. (2.61 vs 2.68 and they generate a different file. However, files that need to be generated by autoconf should probably not be source files!)

[Bart Bogaerts]

Added SPASS changes

SPASS installation kept on modifying files on my system. I committed these changes; seems to work on different PCs now In fact the changes are due to a different version of autoconf

I propose to use 2.68 as this is the newest and installed on the departemental machines However, see issue #484, probably these files should be removed

→ <<cset c5693bb76de7>>

[Broes De Cat]

Either the files are ignored, requiring everyone to have all autotools, or we keep them and in the future might have to update them. The second was chosen.