Cleanup and unify naming of PetscCall routines

Commit-type: housekeeping
/spend 10m

Refactor handling of setable properties of matrices via MatSetOptions()

Introduce PetscBool3 with enum values true, false, and unknown

Use PetscBool3 to store matrices properties in a matrix and cl

Refactor handling of setable properties of matrices via MatSetOptions()

Introduce PetscBool3 with enum values true, false, and unknown

Use PetscBool3 to store matrices properties in a matrix and cleanup interface to check these values

Add full support for symmetric, Hermitian, structurally symmetric, and SPD.

Commit-type: feature
/spend 6h

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Fix a bunch of 'set but not used' compilation warnings

Change if () { PetscCall() } three liner and friends to one liners

for i in `git ls-files | grep "\.[ch]$"` ; do sed 's?\$?ZZZ?g' $i | tr '\n' '$' | sed 's?\([ ]*\)if (\([-;,.\*+=a-z0-9A-Z_>]*\)) {\

Change if () { PetscCall() } three liner and friends to one liners

for i in `git ls-files | grep "\.[ch]$"` ; do sed 's?\$?ZZZ?g' $i | tr '\n' '$' | sed 's?\([ ]*\)if (\([-;,.\*+=a-z0-9A-Z_>]*\)) {\$[ ]*PetscCall(\([- ._+=a-z0-9A-Z>*,()]*);\)\$[ ]*}\$?\1if (\2) PetscCall(\3$?g' | tr '$' '\n' | sed 's?ZZZ?$?g' > $i.joe ; mv $i.joe $i ; done

for i in `git ls-files | grep "\.[hc]$"` ; do sed 's?\$?ZZZ?g' $i | tr '\n' '$' | sed 's?\([ }else]*\)if (\([-;,.\*+=a-z0-9A-Z_>]*\)) {\$[ ]*PetscCall(\([- ._+=a-z0-9A-Z>*,()]*);\)\$\([ ]*\)} \([- ._+=a-z0-9A-Z>*,()]*);\)\$?\1if (\2) PetscCall(\3$\4\5$?g' | tr '$' '\n' | sed 's?ZZZ?$?g' > $i.joe ; mv $i.joe $i ; done

Yes, really ugly but Barry still cannot master awk

Commit-type: housekeeping

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remove garbage from makefiles

Including
* unused FLAGS variables
* All: lib that did not work
* stray blank lines etc

Commit-type: housekeeping
/spend 1h