This makes it possible to import "statefull" C++ objects to Python.
At the moment only the constructor is available on the Python side
so the object can only be used as argument for another C++ function/method.
Exporting methods will be made available as well in a future version.

Argument in `baseClasses` and can be a list.
The classes will be exported within the module without any methods so that
downcasting works

Merge branch 'feature/dune-python-add_cache_lock' into 'master'

ref:staging/dune-python Moved source branch from [!122]

See merge request [staging/dune-python!131]

  [!122]: gitlab.dune-project.org/NoneNone/merge_requests/122
  [staging/dune-python!131]: gitlab.dune-project.org/staging/dune-python/merge_requests/131

point out how to use the load function with a header file which is part of the calling module

simultaniously

Can be used directly in a scipt by calling for example
  dune.generator.setFlags("-g") or dune.generator.unsetFlags() to get the flag used during configure
and
  dune.generator.setNoDependencyCheck() and dune.generator.setDependencyCheck()
before/after a module is compile, e.g., calling dune.grid.yaspGrid(...)

added some simpler methods to use for recompilation/setting CXXFlags and add some logger output

added an option to add additional flags to the default cxxflags
(function dune.generator.addToFlags)

remoove trailing whitespaces from CXXFlags

minor fix

Also:
- sort and make the header files unique in the generated cc files - this
  fixs avoid long header lists
- added better subfigure treatment to plot command
- fixed a few warning

parts [mainIncludeList, additionalIncludeList]
both are added to the generated code but only the first is added to the
_include property of the generated python class.
Usage: one can put the code for exporting the python class into the second
list so that other objects don't pick those up in their dependency list

- only compile levelgridview on demand - so hierarchic grid only contains
  leafgridview
- for a gridview only compile indexset and mapper on demand

the 'DuneTyoe' is declared
Also a minor bug fix concerning the order in which the cc source and
CMakeLists entry to writen - avoids a problem when the str(...) method fails

and added the option to provide user defined preprocessore defines to
the generated code

Martin Nolte authored 7 years ago and Andreas Dedner committed 7 years ago

The builder exceptions should be shared between different implementations of the
builder interface. This patch migrates them to a separate module
`dune.generator.exceptions`. For convenience they are also imported into
`dune.generator` itself.

Rationale: If the user chooses to pass in some other `source` object to
           generate the code on-demand, he can only save the code
           generation if he already ensured the generated source code
           would be identical to an existing copy.

In the original form a failure in the code generation (triggered during
writting by calling code.__str__() could lead to a generated cc file with
no CMakeLists.txt entry - rerunning the code then led to a
"no rule to make target" error and required removing the cc file by hand.

doesn't work with the decorator idea)

dune.generator.__init__

simpleGenerator

also only add plot/triangulation method to 2d grids