logbook search dialog bugs and features

[shroffk]

Log Search dialog has incorrect Title
Text, from and to fields cannot handle spaces
Helper for formatting time fields

[shroffk]

The Tile has been fixed to "Log Entry Search"
The text, from and to fields now support the use of spaces.

Only tooltip string added, it might be best to create general TimeDuration and TimeInterval Dialogs for use in all applications

[kasemir]

Regarding general TimeDuration and TimeInterval handling: #153

[berryma4]

@shroffk can this be marked as done?