Use the SC_VERSION autoconf macro

Conflicts:
	sc
Revert to ax_prefix_config.m4
Remove restrict keywords
Update email address
Adapt libtoolize command line
Update libtool logic
Update configure.ac
remove BUILTIN_ALL_PREFIX
Isolate check for metis in separate m4 file
Rework p4est configure logic
Use PREFIX in metis checks
Make dist allow default to yes
Move subpackage logic into libsc
Comments in configure.ac
Add P4EST_AS_SUBPACKAGE macro
Macro fixes
Write subpackage source string to file
Build system updates
Remove dysfunctional macros
Update metis configuration