Conflicts:
	cmake/ThirdPartyBoost.cmake
	cmake/ThirdPartyPETSc.cmake

Feature/field convert equi output

See merge request !421

Fix/session name prepartitioned

This MR includes the following:
* Fixes the determination of the session name from pre-partitioned mesh directories.
* Remove code duplication of the determination of the session name into a separate function.
* Removes the m_filename parameter (since it no longer makes sense when we can load multiple files) from the session reader.
* Improves the error messages in parsing parameters and solver info to show the erroneous XML element.
* Fixes a segfault if a parameter such as "Test = 1 2" is given.
* Detect when boundary conditions with same ID appears multiple times.

This fixes tickets #148 and #122.

See merge request !426

Allow filename variable remapping

This MR adds the option to remap variable names inside files to different names in XML functions. For example, `IncNavierStokesSolver` fields containing `u,v,w,p` can be mapped to linear advection variables `Vx,Vy,Vz` using the syntax:

```xml
<FUNCTION NAME="AdvectionVelocity">
  <F VAR="Vx,Vy,Vz" VALUE="file.fld:u,v,w" />
</FUNCTION>
```

See merge request !428

Fix/filter modal energy

Fix bug with uninitialized variable in FilterModalEnergy.

See merge request !427

Add regression tests for PETSc

This MR adds some regression tests for PETSc and fixes issues with parallel builds when compiling PETSc as a third-party library.

See merge request !429

Rejig documentation for functions a bit to add subsections, add documentation for filename variable remapping, fix reference

    Made PhysInterpToSimplexEquiSpaced just a method in StdExpansion. This has requried the new method GetNumberOfCoefficients in LibUtilities::ShapeType

    I have also added a brief comment on to GetSimplexEquiSpacedConnectivity

Made PhysInterpToSimplexEquiSpaced just a method in StdExpansion. This has requried the new method GetNumberOfCoefficients in LibUtilities::ShapeType

I have also added a brief comment on to GetSimplexEquiSpacedConnectivity

Bump PETSc to 3.5.2, add missing dependencies, change to using MAKE_EXECUTABLE to avoid parallel build issues

Fix/scotch tests

This MR updates the existing parallel tests to force the use of METIS in the case that Scotch is also selected (which becomes the default). In some cases, Scotch would partition the mesh differently to METIS, which potentially leads to slightly different L2 and LInf errors being reported. The only case I observed this was in the bfs_tg_par test.

I have also included a three tests in MultiRegions which explicitly use Scotch (only active in the case that Scotch is selected, of course).

See merge request !423

Fix/acml

This MR allows recent versions of ACML to be found. Rather than continue searching for specific versions, we now seek any version which is found in the specific base search paths.

This resolves ticket #156.

See merge request !424

Fix/boost apple

This MR fixes the install-path patch. The path to the file was previously incorrect.

This resolves ticket #153.

See merge request !425

This no longer makes sense when we can have multiple session files.
Also removed other unused references in the code.
Removed unused GEOMINFO reading in SessionReader.
Made some of the error messages more consistent and informative.