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Added support for input files to be located in a different directory to the test file.

fix/small_meshgen_compile_error

This merge fixes a compile bug brought up in issue #20.

See merge request !577

Updates to introduce part-only options and make inputXml more efficient

The MR incorporates the `--part-only` feature into FieldConvert and a new option `--part-only-overlapping` which produces overlapping partitions for postprocessing. 

In addition the `InputXml` module in `FieldConvert` has been updated to stop multiple XML reads if there is more than one input file, and introduces some timing options that are useful when running large input files. 

See merge request !569

Add initial version of NekMesh generator

This merge request completely renames and reworks MeshConvert into NekMesh, which along with manipulating meshes can now create them.

The mesh generator is in a early version but it does work robustly for a wide range of geometries and has a basic module for producing prism layers.

There are a number of other changes including new modules for fieldconvert and NekMesh and small tweaks to fundamental libraries to improve the linear elastic solver, namely non sequential id meshes.

Things left to do:
- Write documentation for mesh generation

See merge request !527

Tidy up command line argument code significantly, add a little documentation for MeshPartition and remove header includes from Module.h.

PETSc: use cmake compilers for building PETSc with MPI

this is useful when compiling nektar++ with different compilers as those set in the openMPI config (as mentiones in #18) or when using compiler wrappers such as ccache or icecream.

See merge request !574

Fix petsc without mpi

This MR addresses issue #18, concerning compilation using Petsc without MPI. 

See merge request !572

Fix FilterAeroForces

This MR addresses issue #19, which is caused by `m_index` not being initialized in FilterAeroForces.

See merge request !573

Added tutorials git submodule.

This MR adds a git submodule for tutorials under the docs directory. Tutorials are stored in the tutorials repository in the nektar group. The submodule tracks the master branch of the tutorials repository.

See merge request !507

Moved clang-format requirement back to 3.7.

This MR puts the required version of clang-format back to 3.7 as there is currently another incompatibility with 3.6. It also puts back the option previously removed in an effort to make it compatible with 3.6.

See merge request !570

Feature/field convert i product

This adds a module to field convert the takes the inner product of one field with another or can even be run so that a series of .fld or .chk files can be used which is useful for things like POD or DMD analysis. 

In this MR we have also added a out.stdout output module for the case where we want the evaluate to be written to stdout. 

See merge request !568

PtsIO improvements

This MR adds the ability to read and write .pts files in serial and parallel mode.

It also fixes the PtsField constructor not setting the fieldnames, and adds a FieldConvert OuputPts module.

The only thing that is currently missing is proper management of loading pts files in parallel. The current implementation will load a file matching its rank or fail. Neither PtsFields nor files are designed or meant to carry parallization info.

I did not add any tests because currently, we have no proper way of comparing pts files in a platform independent manner. Hovever all test are green on my machine and i just started this branch on buildbot.

See merge request !562