fix: unify changes for HAVE_RING and HAVE_PLURAL
fixes for the static version
chg: removed SI_THREADS (unsed code)
Fixed broken BS and silenced a failing test (ClearDenom != cleardenom)
Fixing BS
Updating the BS + search pathes for better binary distribution (due to Hans)
chg: removed switching off of switches
chg: updating doc, p1
chg: help system, lib2doc updated

add: primepower as a comment

from master
removed doc from .gitignore
chg: doc. for #432 (cntrlc handling)
fix: tr #442: % and mod are now the same, result is non-negative

from master
add: type conversion for bigint
add: doc for type conversion: list -> ring
fix: description of ordering rp
fix: typo (#467)
chg: MP links -> ssi links
tag more examples

Add a way to tag all examples from a .lib file included.

Use this new feature to tag some libs needed external programs,
special features or significant memory usage in order to be able
to build documentation on more machines.

Make DOC2TEX_EXAMPLE_EXCLUSIONS a make variable, so that this
setting can also be overridden at make invocation time.
chg: MP links -> ssi links
Merge pull request #306 from mmklee/switch

chg: removed switching off of switches