Replace pytriqs with python.

There are still some more occurances of pytriqs.
        Is on my list to be checked.

doc/faqs/faqs.rst

@@ -27,15 +27,3 @@ x optic does not write a case.pmat file
 Make sure that you set line 6 to "ON" and put a "1" to the following line.
 The "1" is undocumented in Wien2k, but needed to have `case.pmat` written.
 However, we are working on reading directly the `case.mommat2` file.
-
-No module named pytriqs.*** error when running a script
--------------------------------------------------------
-
-Make sure that have properly build, tested and installed TRIQS and DFTTools
-using, make, make test and make install. Additionally, you should always
-use pytriqs to call your scripts, e.g. pytriqs yourscript.py
-
-Why is my calculation not working?
-----------------------------------
-
-Are you running in the right shell?

python/converters/plovasp/converter.py

@@ -67,7 +67,7 @@ def main():
     This function should not be called directly but via a bash script
     'plovasp' invoking the main function as follows:
 
-      pytriqs -m applications.dft.converters.plovasp.converter $@
+      python -m applications.dft.converters.plovasp.converter $@
     """
     narg = len(sys.argv)
     if narg < 2:

shells/plovasp.bash.in

@@ -1,4 +1,4 @@
 #!/bin/bash
 
-@CMAKE_INSTALL_PREFIX@/bin/pytriqs -m triqs_dft_tools.converters.plovasp.converter $@
+python -m triqs_dft_tools.converters.plovasp.converter $@
 

shells/vasp_dmft.bash.in

@@ -81,7 +81,6 @@ echo "  Script name: $DMFT_SCRIPT"
 rm -f vasp.lock
 stdbuf -o 0 $MPIRUN_CMD -np $NPROC "$VASP_DIR" &
 
-PYTRIQS=@CMAKE_INSTALL_PREFIX@/bin/pytriqs
 
-$MPIRUN_CMD -np $NPROC $PYTRIQS -m triqs_dft_tools.converters.plovasp.sc_dmft $(jobs -p) $NITER $DMFT_SCRIPT 'plo.cfg' || kill %1
+$MPIRUN_CMD -np $NPROC python -m triqs_dft_tools.converters.plovasp.sc_dmft $(jobs -p) $NITER $DMFT_SCRIPT 'plo.cfg' || kill %1