iPad: Switching days with arrows + other visual fixes

* switching days with arrows in the toolbar
* normal deceleration rate for UIWebView
* standardized margins for table cells (both iPhone and iPad)
* fixed bug B-26 which caused the popover or modal view controller with date picker to appear with a hude delay
* fixed FR-6 - content no longer jumps when hiding nav bar in the prayer view controller
* larger font sizes for iPad