Metacat

Move the cod which transformed the query response to the inputstream to the metacat-common module.
Remove some obsoleted imports.

Move the code to generate the QueryResponseWriter to the metacat-common module. So it can be shared with the metacat-index module.

organize imports

remove extra lines from returned <docid/> block. https://projects.ecoinformatics.org/ecoinfo/issues/5932

Allow use of PID instead of docid in the Perl registry. At least for reading/editing and deleting existing content. Does not create content using a pid. https://projects.ecoinformatics.org/ecoinfo/issues/5932

initialize the SOLR home directory if it does not already exist.

Only after reloading the core, the query result can reflect the change made in metacat-index module.

Fixed a bug to put "OR" correctly in the query.
And remove the user "authorized_user" from the rightsholder clause in the query.

Use the set of subjects to replace the user and groups for the solr query.

escape special XML characters when constructing a pathquery from user input (&). https://projects.ecoinformatics.org/ecoinfo/issues/3017