Fix gettid system call number

Added thread to check for a partition. If state of partition changes, adapt the ERS logging handlers.

Add the possibility to extend at run time the PYTHON_PATH
(i.e. module search path)

-- Configuration is now stored in a text file instead than into
a python class

-- Check the validity of helper files coming from a previously running script

Some more try&except statements handling the database

Use functions of the os omodule to handle/strip/join directories
and files, instead of 'home-made' expressions

Support the disabling of DB access

Do not update the DB configuration, since it is not useful

-- Dynamic loading of the filename parser module added