Fixes INP-1578 - Don't remove "/system/cache/.gitignore" when clearing cache
Fixes INP-1215 - Script tools/clear_cache.sh deletes /system/cache directory
Merge of "in-portal/releases/5.1.3@14548" to "in-portal/branches/5.2.x@14575".
Bug #0001025: Automatically set "svn:keywords" property to PHP files
Releasing version 'branches/5.2.x' (copy from 'branches/5.1.x') of 'in-portal' module.
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