Add a macro to wrap add_executable #85

Job	Run time
docs_install_guide_pdf	1m 48s
docs_examples_sphinx_pdf (arkode)	1m 51s
docs_package_pdf (arkode)	3m 48s
docs_package_pdf (cvode)	5m 0s
docs_package_pdf (cvodes)	3m 53s
docs_examples_latex_pdf (cvode)	1m 37s
docs_package_pdf (ida)	3m 8s
docs_examples_latex_pdf (cvodes)	2m 42s
docs_package_pdf (idas)	3m 18s
docs_examples_latex_pdf (ida)	1m 35s
docs_package_pdf (kinsol)	3m 42s
docs_examples_latex_pdf (idas)	1m 33s
docs_examples_latex_pdf (kinsol)	2m 7s
	36m 2s

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