Embed commons-io (to not conflict with the older version)
Do not copy every field in text, only a few selected ones
Replace UpdateRequestReader with UpdateRequest

Maintaining a custom UpdateRequest subclass isn't worth the trouble,
transforming the Reader into a String is quicker and despite a larger
memory footprint, easier to maintain
Tidy solr configuration

qt isn't required anymore for a ping, and empty lines shouldn't be
kept
Setup the war plugin (not in used yet) to use the default folder names