Travis - error on Clang tidy issues

Style - use component array for DMAddBoundary in navierstokes

Travis - add make style check

PETSc - drop unused struct members in sphere example

Style - fix function indentation for navierstokes

Style - fix pointer alignment for setupsphere

make style

Style - add NOPAD directive to fix make style again

Merge pull request #469 from CEED/jed/doc-examples

Jed/doc examples

Add citation and bib info

Homogenize all section headers style to 40 chars

Use consistent section headers style

This is not only for consistency sake, but it also allows for easy visualization of section breaks

Slightly improve doc of bpssphere

Multigrid - create fineLevel = numLevels - 1 variable for readability

doc: expand exposition on coordinate transformations and metric tensors

Simplify explicit pseudoinverse calculation in bpssphere setup.

Merge pull request #473 from CEED/jeremy/restriction-doc

Restriction - reorder ceed-elemrestriction.c for Doc

Multigrid - use one mat shell for prolong/restrict

PETSc - set GET_DIAGONAL for bps

Multigrid - simplify diagonal computation logic

PETSc - simplify calls to gather/scatter

Restriction -reorder ceed-.l.mrestriction.c to get correct documentation grouping

PETSc - convert multigrid example to use GAMG on coarse solve

make: revise configure target

make configure now only caches non-default variables, identified by
whether they are simple (set with :=, as in config.mk) or originate
from the command line. Usage is

make: revise configure target

make configure now only caches non-default variables, identified by
whether they are simple (set with :=, as in config.mk) or originate
from the command line. Usage is similar to before, but should be less
fragile/simpler to edit, and support setting more things.

This includes saving OPT, superseding PR #422.

Reported-by: Veselin Dobrev <dobrev@llnl.gov>

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make: print-% target also mentions the flavor (simple vs recursive)

Simple variables are set with := and expanded eagerly. Recursive
variables are set with = and expanded in the context of the targ

make: print-% target also mentions the flavor (simple vs recursive)

Simple variables are set with := and expanded eagerly. Recursive
variables are set with = and expanded in the context of the target.

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make: use target-specific CPPFLAGS for -I and -D for all languages

Avoids redundancy and simplifies the job of setting CFLAGS, NVCCFLAGS, etc.