new log file location, bug fixes

* analysis.log has been removed. log files are now placed in a log
directory. Each time a module is run a new log file is created in the
log directory with a date and time stamp. When PIPELINE is run all
modules called by PIPELINE are included in a single log file.
* error checking in TRIM now doesn’t happen during debug mode.
* FASTQC no longer calls the FastQC app in debug mode.