Bug 30579: (follow-up) Add fieldsets and style disabled elements

Bug 30579: (follow-up) Add fieldsets and style disabled elements

This patch surrounds each section with a fieldset which allow enabling/disabling
all the elements in one go. CSS is added to make it clear which fields are disabled.

Button for item specific is moved form the multi-hold section

Javascript is simplified to use the new fieldsets

To test:
1 - Repeate test plan on earlier commit
2 - Additionally, search and select multiple records and place hold
3 - Confirm multi-hold placing works :-)

Signed-off-by: Emily Lamancusa <emily.lamancusa@montgomerycountymd.gov>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>