luceneapi 6.x-2.0-beta1

Upgrading
- Upgrading from 2.0-alpha requires update.php to be run and a rebuild of the search index.
- There is no upgrade path from the 1.0 branch. The existing module must be uninstalled before installing a 2.0 version.
- The 2.0 API is vastly different than the 1.0 API, and custom code will most like break between versions.

Bug fixes
- #609102: Cache must be cleared for the "Hide core search" setting to take effect
- #609098: Documents aren't deleted when content types are added to the exclude list
- #603892: Modules that don't implement hook_search('name') show up in the "Hijack search box" list
- #559386: Porter stemmer project is not integrating with Search Lucene API
- #590732: Add mbstring check, iconv check and PCRE unicode support check to hook_requirements().
- #600910: Content bias is not currently possible when default operator is set to "AND"
- #592424: Error after installing the module
- #589430: By default, all Lucene fields are searched
- #584144: Wrong parameter count for min() error when only one taxonomy facet is enabled

Features and enhancements
- #560512: searching just with facets (without any search keywords)
- #606048: Change Yes / No radios to checkboxes in admin settings forms
- #541168: Usability of "wipe index" button
- #602380: Add option to "Minimum word length" to inherit valur from core Search module
- #563216: search result weightings
- #590686: Move PHP requirement into .info file
- #590624: Change all instances if "is_null()" to "=== NULL"
- #563174: Configurable limit to the Result Set Limit
- #589412: Separate title text from "contents" field