Fixed and reactivated M1ErrorTest
Semantic Analyser: Detect undeclared identifiers.

Undeclared identifiers have no symbol table entry.
Merge branch 'master' of github.com:swp-uebersetzerbau-ss13/fuc
Fix: Also show warnings.
correct the code
add lexertest
fixed tokenizing of dots and tabs
Revert "correct the code"

This reverts commit 606ccb8a689155708ffee08e94e184bfda97ac36.
Revert "add lexertest"

This reverts commit 3b55ddd96b5fd4e2cf056b27d39ce2c5b57c008a.
speed up build process, decrease test output, changed forkmode of junit to once