add C_Integer examples to C

see here https://github.com/orgs/TermCOMP/discussions/91 for details

rename folder to meet rule

Submission from myself

Merge branch 'master' of github.com:TermCOMP/TPDB

The version used in TermCOMP 2019

imigrated from https://cl2-informatik.uibk.ac.at/mercurial.cgi/TPDB