View for scheduled/budgeted transactions

(from [47]) [#3 View for scheduled/budgeted transactions] Started implementing a Schedule view. For now, it's read-only and has a lot of code duplication with ttable.

(from [48]) [#3 View for scheduled/budgeted transactions] Fixed issues with Stop Date field edition. It's the first date field with a possibility of a None value, so the date field editor had to be improved to support that.

(from [49]) [#3 View for scheduled/budgeted transactions] Implemented basic schedule edition in the sctable.

(from [50]) [#3 View for scheduled/budgeted transactions] Disabled inline edition for the schedule table. After having tried to add a NSPopUpButtonCell as a cell for the Repeat Type column, it turns out that doing so messes greatly with the edition system. There doesn't seem to be an easy workaround so, for now, the schedule and budget tables edition will be modal only.

(from [52]) [#3 View for scheduled/budgeted transactions] Added a first (barely) working schedule info panel.

(from [53]) [#3 View for scheduled/budgeted transactions] Various improvements to schedule edition: fixed repeat_every_desc crash, refresh repeat_every_desc on load, start edition on return + double-click in sctable.

(from [54]) [#3 View for scheduled/budgeted transactions] Fixed a crash when using up/down arrows on invalid date in date editor.

(from [56]) [#3 View for scheduled/budgeted transactions] When changing the ref transaction of a schedule, reset spawn cache (so that the changes are actually reflected in the spawns right away).

(from [57]) [#3 View for scheduled/budgeted transactions] It's now possible to add a new schedule through the sctable+scpanel.

(from [58]) [#3 View for scheduled/budgeted transactions] Added support for deletion in sctable.

(from [59]) [#3 View for scheduled/budgeted transactions] Removed support for scheduling in the tpanel (redundant with scpanel), which required changing around a lot of tests so the use scpanel rather than tpanel for schedule setup.

(from [60]) [#3 View for scheduled/budgeted transactions] Refactoring: removed some code duplication in the scpanel.

(from [61]) [#3 View for scheduled/budgeted transactions] Refactoring: removed a lot of duplicated code in panel code on the cocoa side.

(from [62]) [#3 View for scheduled/budgeted transactions] Refactored the date increasing algorithm in schedules into a DateCounter iterator class, and made the exceptions of a schedule clear themselves upon repeat_type, repeat_every or start_date changes.

(from [64]) [#3 View for scheduled/budgeted transactions] Added undo support for schedules.

(from [65]) [#3 View for scheduled/budgeted transactions] Added keyboard shortcuts for selecting the schedule view.

(from [66]) [#3 View for scheduled/budgeted transactions] Added the "Make Schedule from Selected" feature.

(from [67]) [#3 View for scheduled/budgeted transactions] Refactoring: Moved panel code around so more GUI control is given to the py side (pre_load, post_load, pre_save).

(from [68]) [#3 View for scheduled/budgeted transactions] Refactoring: I had forgotten to refactor the new() method of the schedule panel in my last commit.

(from [69]) [#3 View for scheduled/budgeted transactions] The Repeat Type column in the sctable now has the same value as in the scpanel (rather than just the rtype identifier).

(from [73]) [#3 View for scheduled/budgeted transactions] Began implementing the budget table.

(from [74]) [#3 View for scheduled/budgeted transactions] Added the budget info panel.