mediainfo: added displayAspectRatio for images
added mimetype to file info (not only to image files)
added basic caching for mediainfo
fixed bug in redis cache
changed spit for media info to be usable for a number of file in a row
added a test benchmark for media info
remove filename from fileinfo-constructor
added clearInfo to media info to clear cache
depage-legacy: added getting of library tree
depage-legacy: added ability to get file listing
updated cssmin/jsmin to use log-class with namespace
added xml-helper function to get document and node