Webfrontend: Show detail popup on upcoming/conflicting showings in Scheduling page.
Webfrontend: Fix a possible invalid page request when scrolling down Recording/Upcoming lists
Webfrontend: Disable a debugging error popup
Match on callsign instead of channum when marking rsOtherShowing. We merge channels with the same callsign in the guide _not_ channels with the same channum.
Webfrontend: Remove stray comma in css that broken status colour coding of in-progress recordings