Fix how Albany gets trilinos, plus some cleaning

[bartgol]

Notably:

• albany decides its own compilers, regardless of what trilinos used
• find_package() must be called after project()
• don't assume structure of trilinos install folder (if possible)
• remove unused options

Fixes #982

[mperego]

Thanks @bartgol. Is this going to solve also the issues that Jim is seeing in E3SM? Note that E3SM is linking an old version of Albany.

[bartgol]

Thanks @bartgol. Is this going to solve also the issues that Jim is seeing in E3SM? Note that E3SM is linking an old version of Albany.

I don't think so. I need to re-do the installation of albany. It's not super long, but since he found a workaround, I don't think it's a priority.

[bartgol]

This works on my workstation. Merging, according to discussion in today's telecon.

@ikalash We'll need to revert the hack of setting GNUInstallDirs. At the telecon we were suggesting to roll back a couple, to make sure we're still getting coverage if this fix ends up not working as expected. How do you want to handle? I can simply revert the commits you did for the dashboards, if you think that's ok.