Incorrect pitched percussion instrument default ranges in Instruments.xml

In Musescore 2.0.3, there are several pitched percussion instruments that have an excessively narrow "professional" range in the default instruments.xml

Findings I have:
* Marimba has "Amateur" of C3–C7 and "Professional" from F2–C7. The "usual" marimba in the wild is a 4⅓ octave model that's from A2–C7, so that should be the new "Amateur" range. For "professional" marimba literature, the modern standard is typically 5 octaves from C2–C7, though custom instruments exist that have range of up to A1–C8.
* The "bass marimba" (really more of a contrabass) has a few errors. First, it's a single-staff instrument with a bracket that appears by default. Second, its professional range is all wonky, with the highest pitch being listed to the left of the lowest pitch, which causes *every* note to be highlighted in red. Basing my "professional" range on the contrabass instrument made by Planet Marimba, an A0–C4 would be a good approximate range.
* The Glockenspiel should add a note or 3 to the bottom end of the "professional" range. There are fairly common F5–C8 models available, and I know that instruments that go down to E5 are not unheard of.
* Tubular Bells have a good range, though there is a (presumably very rare) bass chimes set (Adams is one such manufacturer) that would bring the low end down to F3 or thereabouts
* Xylophone: both "amateur" and "professional" models usually go all the way up to C8
* Timpani: the range of D2–C4 is a good amateur range. However, you could tune the large drum to a C2 and you could also get a 20" timpano that could hit a D4, so the professional range should be expanded to C2–D4
* FYI: crotales and vibraphone both have good default ranges, so they don't need any tweaking

I'll set this as "needs info" in case anyone has further discussion on the exact ranges that should be used. Should I also submit this as an issue over on GitHub?

GIT commit: 3c7a69d