new: imap test in gf case

fails on 64bit machines, one of the reasons, why imap.tst fails there
fix: correct results for bigints.tst

99999999...9 is 1*10^something in float, not 1.5...* 10^something
fix: number to float conversion on 64bit machines
updated .gitignore (automake1.13)
Merge pull request #283 from mohamed-barakat/spielwiese

updated .gitignore (automake1.13)
fix: ntGreater (Short/bug_tr329)
Merge pull request #284 from YueRen/thurnau

Thurnau
updated .gitignore
Merge pull request #285 from mmklee/fix_sw

fix: interchanged dst and src
Check for negative characteristic
Commented out IsPrime
Changed warning after failed GF table lookup to error, fixed typo HABE_RINGS
Fix the usage of IsPrime from numeric/*
fix: nonexistant overflow during numbers->float throwing error
fix: wrong name of test
Merge pull request #286 from YueRen/thurnau

fix: non-existant overflow from numbers->float throwing error
Fix BS: use common m4 dir (via ACLOCAL_AMFLAGS and AC_CONFIG_MACRO_DIR)
fix: missing check for n_Zp