When the YACY_DATA_PATH environment variable is set, shell scripts will
now use the given path instead of relative ../DATA which remains the
default when the variable is not set.
Necessary in the context of Snap package (see issue #254) as YaCy is
started with startYACY.sh and an absolute DATA parent path in parameter.
- move the header framework classes to cora
- move the ARC caching classes to cora
- refactoring of code to call these classes from cora
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@7068 6c8d7289-2bf4-0310-a012-ef5d649a1542