Eeschema: fixed some issues in undo/redo and ESC commands related to hierarchical sheets; Work in progress

Grid list display in popup menu: go back to the previous version, due to problems when using tabs in this menu.

fixed very minor bugs.

Build BOM: in one part per line, fields are now selectable (like others formats)

* Some bugs fixed
* Starting enhancements in Libedit: menubar and commands to "plot" current component in PNG or SVF file (SVG file not fully working, must be refined)

output 8 user fields

* 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.

German translation update. Replaced dialog page settings dialogblock version by the same built with wxFormBuilder

Updated Polish translation from new member of Polish Kicad Team: Paweł Dras <dexx.electronic@gmail.com>
Thanks!

Fixed an issue (footprint name not read from netlist) when using a netlist without the corresponding .cmp file.

Revert to previous dialog_layer_setup_base, and added (conditional compilation) option to hide/show no used inner copper layers and define inner layers order (see changelog) in dialog layer setup.

Revert to previous dialog_layer_setup_base, and added (conditional compilation) option to hide/show no used inner copper layers and define inner layers order (see changelog) in dialog layer setup.

Fixed bugs 2965646 (Canceling text operation hides text) and 2959930 (Pcbnew inconsistent Layer names sequence)

- in bloc delete, *do not delete* reference and value fields, that must always exits.
- in block copy *do not duplicate* fields that must be unique for the whole component.