Allow bibliography path and link URL to be configured

[olvidalo]

Currently, the t:ptr[@target] template in htm-teibibl.xsl hardcodes two EFES specific values:

• The path to the bibliography authority file (webapps/ROOT/content/xml/authority/bibliography.xml relative to system-property('user.dir') provided by the Java runtime through EFES/Cocoon
• The bibliography item link URL pattern (../concordance/bibliography/{id}.html).

This makes it hard to use the stylesheets outside of EFES, or with different output site structures that don't follow EFES' patterns.

This PRs uses two configurable params following existing conventions to solve this:

• The htm-teibibl template now uses $localbibl to construct the path to the bibliography file
• In global-varsandparams.xml, $localbibl is set to the currently hardcoded default path via the new $default-bibloc variable, ensuring full backwards compatibility without breaking existing projects
• The new $bib-link-template param can be used to provide an URL template where $1 is replaced by the bibliography entry ID. Defaults to current pattern ../concordance/bibliography/$1.html for backwards compatibility.

It would be great if this could be considered for merging as one step to make the stylesheets more independent from EFES.