Search through rotated action log files #1141
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When using Webmin for installation with long term logfile archiving requirements, rotating the webmin action log is necessary to wipe them out after some period.
Doing this, the "Webmin Action Log" module is not capable of search through the rotated files.
This patch creates a possible method for handling this with adding a new global config option "logsearch_rotated".
When this is set to 1, the action log modules composes a summary action log file with all rotated contents and uses this as source for index and display.
Alternative way would be to include the filename also in %index. But there is the problem on deleting from %index, when an external logrotate has removed a rotated file.