---- Changes since 1.140 ---- Added an option to have environment variable substitution done on edited filenames. ---- Changes since 1.150 ---- Added an option to clear Webmin-related environment variables before running a command. ---- Changes since 1.210 ---- File editors can how have parameters, which are substituted into the filename before editing. ---- Changes since 1.220 ---- Added a new type of command - an SQL query or update that will be performed against a database for which a Perl DBI driver is installed. ---- Changes since 1.230 ---- If other servers are defined in the Webmin Servers Index module, custom commands can be configured to run on one or more other Webmin hosts in a cluster. ---- Changes since 1.250 ---- The output from a command is now shown as it is generated, for commands run locally. Added a Module Config parameter to change the number of columns used to display command buttons in. ---- Changes since 1.270 ---- The contents of uploaded files are no longer logged. ---- Changes since 1.340 ---- Removed the Module Config option to control if a shell is used when executing a command as a user, since we can now work this out automatically.