IR_config_constants: added path to Test archive and use this variable in...

IR_config_constants: added path to Test archive and use this variable in downloadversionIRdata when building an archive path
downloadversionIRdata: consistent use of testmode parameter
downloadversionIRdata: added testmode to all reading routines allowing reading from Test archive
IR_image_tools: no longer sets working directory to script file location
IR_config_constants: sets parameter_file_path as absolute path
downloadversionIRdata: new function get_trigger_from_PID() wraps get_program_from_PID() and allows getting timestamps for lab data
downloadversionIRdata: download_images_by_time_via_png() now uses nanosecond timestamps to call AKF_2.get_time_intervals()
downloadversionIRdata: disable DeprecationWarning in import of archivedb (timezone issue on Windows)
downloadversionIRdata: get_NUC_by_times() uses the reference cold frame in case no cold frame (NUC frame) was found for this time
downloadversionIRdata: unified use of stoptime instead of endtime
downloadversionIRdata: expanded testing sections (profile, coldframe, timestamps and scene model)