NETINFO_ITEM::m_Net and NETINFO_ITEM::m_Netname are const.

Changes to be verified:
- pcbnew/minimun_spanning_tree.cpp: It segfaults is m_Size == 0
- pcbnew/exporters/export_gencad.cpp: I removed the SetNetname() call, as it changes only the unconnected net and in the next line it returns if the net is unconnected. Still, I wonder if name for the unconnected net matters. What about tests that check if a net name is empty to decide if it is unconnected net or not.

Pcbnew, Eeschema: remove include file <protos.h> from a lot of files which do not need it.

all: remove include <protos.h>  from a lot of  files which do not need it.

https://lists.launchpad.net/kicad-developers/msg11965.html

Update demos. Fix  pspice netlist issues when using ( and ) in net names ( parenthesis are replaced by underscore) .

Commit patch about new better vrml export. patch to fix mirrored page layout when print mirrored is enabled ( page layout should not be mirrored)

[MacOSX] Added support in boost context for PPC processors, now is possible again compile kicad testing for PPC ( https://svn.boost.org/trac/boost/ticket/8266 )

Pray for angus johnson who is support too many languages, and needs to find a text editor that removes trailing whitespace.

Pcbnew: very minor fixes and update:  update clipper version. uncrustify polytri/* and fix some warning compil.

Switch to boost::context for all platforms, almost.
Please try your platform by commenting out fcontext.s in common/CMakeLists.txt.

[MacOSX] fixes issues with previous OSX compilers gcc-4.2 and makes a better general beaviour of KICAD_BUILD_STATIC

eeschema: fix compil issue. Boost build: boost lib context built only on OSX (does not build on mingw, and not needed)