APCD v1.0.6 - APCD Registration form updates and other bug fixes

What's Changed

• Bug/WP-483 - APCD fixes for extensions by @chandra-tacc in #268
• Bug/WP-484: Remove text from threshold form by @chandra-tacc in #267
• task/WP-481: Registration form updates by @edmondsgarrett in #270

Full Changelog: v1.0.5-apcd...v1.0.6-apcd