Copy gmt.conf if movie or batch detects one in current directory #4781
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Description of proposed changes
This PR seeks to let batch and movie be able to use any gmt.conf files found in the directory when these commands are run. The reason we need to do something specific is that the GMT commands contained in the scripts are run in different directories than where batch or movie starts. Thus, we must actually place the gmt.conf file in all the directories where the scripts are run form. The algorithm implement is this:
The documentation has been updated and also points out that users cannot use the preflight script to create a gmt.conf since it will be created in a hidden directory that is deleted upon completion.