fix typo
cleanup and add more tests to configure.ac
drop complex_missing_std, not inclusions to std

* we should not mess with std namespace
remove complex_missing_std, cleanup math/Makefile.am

* Nothing should be added to the std namespace.
  All math functions are now in the qucs namespace

* makefile.am : one source per line makes it easier to spot changes.
many namespace changes on real and complex math

* all math functions live on qucs:: namespace
* do conflict resolution on the cpp file (after checking for available functions)
* moved docstrings to cpp file
* removed all inlines, can add later if benchmark is available
* sorted functions in similar order as configure.ac

* The main reason for the qucs namespace is to provide a consistend API and
  resolve conflicts. Some C++ implementaions do not have the same set of
  functions on the std namespace for instance. We better test on each platform
  and provide a way to resolve them. Later we can think about spliting the
  namespace futher (ex. math, real, complex...).
minor cleanup on the bessel fallback code
resolve namespace conflicts on component/devices

* Various functions are abiguous on qucs:: and std::
  Make qucs:: explicit.

* The issue here was that depending on the implementaion
  some functions were not on the std namespace. Now we make sure
  they are on the qucs:: namespace. Some simple funcions could be used
  straight from std, however we also have some custom overloads that may
  cause conflicts once again.
resolve namespace conflicts on component/microstrip

* see previous commit
resolve namespace conflicts on various components

* see two previus commits
resolve ambiguous pow
remove macros moved to functions

* these are now either in real.h or complex.h
simplify the analogfunction inlines

* no need to use qucs:: namespace
* use ordinary functions from global namespace
changes to verilog XML files

* no need to use qucs:: or std:: on basic functions
* moved from fabs to abs (C++)
* qucsVersion.xml: resorted the c:math template, similar to LRM and analogfunctions.xml
* added a few comments
comment on make check, assert functions
add brief configure result info
initial support for Google Test library

* the source code needs to be placed on the qucs-core tree, under lib/gtest
* to avoid issues, googletest is compiled with the same flags as qucs-core
added intial unit tests for libqucs
gitignore lib/gtest
travis: workaround isse installing ADMS
add message with configure results