Support for wheezy

+ small fixes to compile master on wheezy
building stable
meteoprog reads two previous time formats
Fixes in build system to ease cross compilation

+ added option --with-prefix that sets path where libraries are stored
+ change to pkg-config when looking for some libraries
Fixes in debian rules for cross-building

+ set proper --with-prefix if cross compilation detected
building stable
Fixed isl serving when paramd is down

* Added custom XSLT function for URL retriving
with proper error handling and logging problems.
Small upgrade szrsync script

+ now szrsync support downloading only specified subtree of
  configuration. For example to download only "Kociol_1" one can call:

      /opt/szarp/bin/szrsync gcwp/szbase/Kociol_1
Fix in sending params to Z-ELEKTRONIK PLC

* Data send to PLC was ignored due to wrong request format
Add new daemons log directory to logrotate
Merge branch 'devel'

Conflicts:
	debian/changelog
building stable
building unstable
building unstable