The two classes PushBackTuple and PushFrontTuple are both implemented
using a long list of template specializations.  This makes for a lot
of code, and it also limits the maximum tuple size that can be used.
Using variadic templates (FYI: available since gcc-4.3) instead
allows a generic implementation in only a few lines of code, and
only the compiler being the upper limit on tuple size.

An implementation using variadic templates has already been given
in the documentation of PushBackTuple/PushFrontTuple.  This patch
starts to actually use that implementation, provided that
HAVE_VARIADIC_TEMPLATES is set.  Otherwise the old implementation
is used.

Because the latter uses the C++11 standard library naming.

The C++11 standard library offers the functionality of SelectType,
it is, however, called 'conditional'.  This patch adds a copy
of our SelectType implementation with the class names changed
to match the ones used in C++11.  The old SelectType implementation
gets deprecated.

- update documentation
- add paranoia check to touch()

update documentation

This fixes FS#1317 for me (use invert for 2x2 matrix with
std::complex< long double >).
The problem is that 1.0 is a double, which can be converted implicitly
to a long double which, in turn, could be converted implicitly into a
std::complex< long double >. However, the compiler does not use two
implicit type conversions, so double cannot be divided by a
std::complex< long double >.

See FS#1317 for details.

This is the same fix as for debugallocator. See flyspray #1287.
The problem was that move semantics were used if the compiler supports
variadic templates.

In order to reuse the same source file, the fassign tests pass in
the values to be assigned as a preprocessor define. Unfortunately,
the preprocessor of clang 3.3 dies on this list if it contains spaces.

In order to reuse the same source file, the fassign tests pass in
the values to be assigned as a preprocessor define. Unfortunately,
the preprocessor of clang 3.3 dies on this list if it contains spaces.

fix global extern variable

also test assignment of fieldmatrix from densematrix

[[Imported from SVN: r7472]]

Patch was kindly provided by Bernd Flemisch.

[[Imported from SVN: r7465]]

(kudos to Elias Pipping for the patch)

[[Imported from SVN: r7436]]

Fixes FS#1271.
(Kudos to Elias Pipping for the patch)

[[Imported from SVN: r7435]]

[[Imported from SVN: r7431]]

[[Imported from SVN: r7430]]

[[Imported from SVN: r7425]]

[[Imported from SVN: r7421]]

[BugFix] Copy rep_ member of SharedCounterImpl during copy constructor (otherwise the deleter might work on a unitialized pointer).

[[Imported from SVN: r7420]]

[[Imported from SVN: r7415]]

[[Imported from SVN: r7414]]

Patch by Bernd Flemisch

[[Imported from SVN: r7385]]