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 >.

Patch by Elias Pipping

[[Imported from SVN: r6915]]

As suggested by Christian in FS 1147.

Implemented by Elias Pipping.

[[Imported from SVN: r6913]]

This fixes FS 1147.  Thanks to Elias Pipping for the patch.

[[Imported from SVN: r6819]]

With the exception of mpicollectivecommunication.hh
and propertymap.hh, which I didn't understand.

[[Imported from SVN: r6784]]

[[Imported from SVN: r6714]]

Backported from Martin's development branch,
minus some whitespace changes.  Thanks.

[[Imported from SVN: r6712]]

[[Imported from SVN: r6708]]

[[Imported from SVN: r6677]]

[[Imported from SVN: r6558]]

[[Imported from SVN: r6534]]

[[Imported from SVN: r6533]]

See FS#966.

[[Imported from SVN: r6521]]

[[Imported from SVN: r6512]]

[[Imported from SVN: r6495]]

[[Imported from SVN: r6370]]

[[Imported from SVN: r6369]]

rbegin -> beforeEnd
rend   -> beforeBegin

[[Imported from SVN: r6286]]

[[Imported from SVN: r6268]]

use className to get a better error message when a specialization of istl_assign_to_fmatrix is missing

[[Imported from SVN: r6250]]

[[Imported from SVN: r6247]]

[[Imported from SVN: r6234]]

[[Imported from SVN: r6210]]

[[Imported from SVN: r6206]]

[[Imported from SVN: r6205]]

[[Imported from SVN: r6185]]

* factor out most of the FieldMatrix math methods

missing: several functions oculd not me moved, as they require som
		 kind of type promotion traits

[[Imported from SVN: r6181]]