[mythtv-cmyth] Add missing rule filter "This Channel"
[mythtv-cmyth] Implement recording rules for MythTV 0.27

"Repeating" rules have to handle new behaviors based on filtering.

With EPG:
- Daily: "All record" + filter "This channel" & "This time"
- Weekly: "All record" + filter "This channel" & "This day and time"

Without EPG (custom):
-  Daily: "Daily" + filter "This channel"
- Weekly: "Weekly" + filter "This channel"

Refactor disabled rules "Channel record" & "One record" for future
usage as menu-hook by using a common interface with epgInfo as input.

Some rules cannot be implemented depending on the context.
For these cases the nil type is used (Not recording) and an attempt to
schedule such a recording will fail.

New virtual function GetMetadata() estimates rule metadata depending
of the backend version.
[mythtv-cmyth] Use MythScheduleManager::GetMetadata()
[cmyth] Add missing recording rule fields

Not null values for programid and seriesid are required for filtering.
Null values (not nil strings) fail DB SQL search.
[mythtv-cmyth] Rules: Fix program filtering by programid and seriesid

Set programid and seriesid in recording rule to allow filtering by
series.
[mythtv-cmyth] Toggle show/hide not recording

Function MythScheduleManager::ToggleShowNotRecording() allows to enable
or disable visibility of 'not recording' rules.

This allows to implement a new hook to enable or disable visibility
and manage 'not recording' rules.
[mythtv-cmyth] Manage special recording rules

Manage "Not recording" rules with PVR timer screen:
- Add setting menu hook "Show/Hide "Not recording" rules"

New functions to make and break a broadcast UID for program.

Create special recording rules:
- Add EPG menu hook "Record all showings (this channel)"
- Add EPG menu hook "Record this showing every week"
- Add EPG menu hook "Record this showing every day"
- Add EPG menu hook "Record one showing (all channels)"
- Add EPG menu hook "Record new episodes (this channel)"
[mythtv-cmyth] Remove EPG gap correction

Not required since XBMC PR#3111 is merged.
Also it will allows to show gaps on EPG timeline grid with PR#3888.