Adding FQSEN in addition to Fully Qualified Structural Element Name (FQSEN)

This is needed to fix links to `term:FQSEN`.
Fixing typo - @deprecated instead of @ignore
Merge pull request #938 from JDGrimes/develop

Develop
Update var.rst

Added documentation for the @var tag.
Update var.rst

Applied suggestions.
Update var.rst

All document sections are complete for @var. Please review.
Add puppi and apache submodule
Add missing apache include
Removed unused tests
Removed unused tests
Add tests for Compiler/Linker/Linker
Added vfsStream to composer for filesystem mocking
Fixed incorrect vsprintf call
Added CheckStyleTest
Add test for uncovered method in Compiler/Pass/Debug
Added coverage annotation
Removed dead code
Removed more dead code
Add test for not covered method in Compiler/Linker/Linker
Start with ElementsIndexBuilderTest