added stop-upload command; removed un-needed file stats; improved daq/upload reporting; cleaned up un-needed keys from catalog plugin

reworked reporting for both daqs and uploads; improved ftp utility efficiency; simplified file processing

found bug with empty destination directory;prevent checking for upload if plugin does not need to process files

modifications to eliminate processing of hidden files and of unchanged files that were processed already; checksum is now done by default

fixed few issues found while testing gridftp plugin and file observer; made observer more generic by shifting some functionality to agent

Added exception catching for directory events. This is intended to fix a possible crash of watchdog and never seeing file changes