Error logging for bash script

[wmkouw]

Goal: whenever one of the modules fails, the bash script should exit and write the error to a module-specific log-file.

[wmkouw]

Implemented in commit 8970e66.

At the moment, the script performs the following actions for each module:

• reports "Starting X... "
• writes functional output to a .naf file
• writes runtime stdout to a .log file
• writes stderr to a .err file, but if this file is 0 bytes, then it removes it again.
• checks if .err file exists, and if so, exit with status 1. If not reports "complete."

Note: some of the modules don't have runtime stdout; I'm thinking of making logging optional.

[wmkouw]

Problem: some modules push their error messages to stdout instead of sterr.

[wmkouw]

New setup for error handling:

Both progress reporting and errors are sent to a .log file. If the exit status of the module is 0, then delete the log file, rename the temporary .naf output file and proceed.

If the exit status is not 0, then report the contents and name of the .log file and exit with code 1 to 13 for each module.