* Changed managed cursor callback definition to include the current
cursor drawing position.
* Modified all managed cursor callbacks to match new definition.
* Added snap to grid option to base drawing frame object.
* Changed add no connect managed cursor callback to use new position
parameter instead of the stored one.
* Lots of coding policy fixes.
* Rename sch_item files to sch_junction.
* Make global variable g_ItemToRepeat a private member of SCH_EDIT_FRAME
object.
* Encapsulate SCH_SCREEN reference count member.
* Move update block pick list code to SCH_SCREEN object.
* Remove redundant drawing function RedrawOneStruct().
* Change context menu text "Noconn" to "No Connect".
* Change context menu text "GLabel" to "Global Label".
* Replaced find dialog with wxFormBuilder version.
* New find dialog is modeless, supports more advanced search features,
remembers it's last position, size, search history, and search settings,
and implements initial support for replacing.
* Added Shift+F5 hot key to search for next DRC marker. F5 now just
repeats previous search.
* Minor cosmetic enhancements to label edit dialog.
* Remove tab from grid size text printf to fix toolbar grid combobox
display in wxGTK.
* Updated my TODO list items.
