Update PCB from Schematics doesn't require reannotate

[Chris Pavlina]

When saving a netlist, the annotation dialog is displayed if there are any annotated parts. However, "Update PCB from Schematics" does not, and will attempt to transfer these parts over. This results in multiple parts on the PCB with the same name.

Application: kicad
Version: (2016-10-17 revision c483574)-master, release build
Libraries: wxWidgets 3.0.2
           libcurl/7.50.3 OpenSSL/1.0.2j zlib/1.2.8 libidn/1.33 libssh2/1.7.0
Platform: Linux 4.7.6-1-custom x86_64, 64 bit, Little endian, wxGTK
- Build Info -
wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8)
Boost: 1.61.0
Curl: 7.50.3
KiCad - Compiler: GCC 6.2.1 with C++ ABI 1010
        Settings: USE_WX_GRAPHICS_CONTEXT=OFF
                  USE_WX_OVERLAY=OFF
                  KICAD_SCRIPTING=ON
                  KICAD_SCRIPTING_MODULES=ON
                  KICAD_SCRIPTING_WXPYTHON=ON
                  BUILD_GITHUB_PLUGIN=ON
                  KICAD_USE_SCH_IO_MANAGER=OFF
                  KICAD_USE_OCE=OFF