Bug 14956: C4::Dates from files opac/*.pl

Bug 14956: C4::Dates from files opac/*.pl

Remove C4::Dates from files:
-  opac/opac-memberentry.pl
-  opac/opac-reserve.pl
-  opac/opac-search-history.pl
-  opac/opac-showreviews.pl
-  opac/opac-suggestions.pl
-  opac/opac-serial-issues.pl
-  opac/opac-alert-subscribe.pl
-  opac/opac-ics.pl

To test:
- Apply patch
- Verify, that self registration and holds work as before
- Verify that tabs in catalog item detail work and display
  as before
- For serials: Verify that subscriptions work as before. It is a
  little bit hidden, in tab Subscriptions, then 'More details', then
  tab 'Brief history', button 'Subscribe to email notificatin on
  new issues'
- For ics: Can not be tested at the moment, not yet used (Bug 5456),
  pls. have a look at the code changes

(Amended following comment #2)

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>