modified python examples to load the wrapper using 'import' instead of 'execfile'
made location of file containing run number configurable in data collector

- previously hardcoded; default still "../data/runnumber.dat"
- configuration only possible when instatiating the data collector
added support for a different run number file location to test data producer
extended documentation and example config wrt to path specifications for the data collector
fixed compareRawFiles.py to use the full path when determining the file by the last run stored in runnumber.dat
finalized implementation of first regression tests using CTest and the Python wrapper around EUDAQ routines

- addressses issue euadq/eudaq#57
- can be run using 'make test' or 'ctest'
- include one dummy run with RunControl, DataCollector and Producer sending fixed data packets; written file is compared against reference file stored on AFS
minor improvements to python ctypes wrapper

- fixes warning in pyruncontrol
- wrapper determines path to shared library automatically
- pydatacollector supports changing the location of the run number file