Fix minor compiler errors (macro expansion, duplicate using)

[dermesser]

for issue #1312 - probably doesn't fix it, but contributes to improvements.

[gonuke]

Thank you @dermesser. Please add a news update by copying news/TEMPLATE.rst to a file with a name that matches your PR's purpose and fill in the appropriate sections. (We should clarify this as a requirement of a PR.)

[dermesser]

I took the liberty and also fixed a second one-line issue (a duplicate using directive), that triggered compiler errors with at least some GCC versions for me. This way, the added news "article" is worth it :)

[dermesser]

(We should clarify this as a requirement of a PR.)

I opened #1561 for this - I hope I understood you correctly :)

[gonuke]

thanks @dermesser - this looks good to em

[bam241]

btw we probably want to transpose that change in PyNE, as we changed the pyne.h