Revert custom changes in Xmlm library
Revert custom changes in Xmlm library

We don't need them any more, because we've implemented desired XML indentation
output mode ourselves.

alavrik/piqi,alavrik/piqi,Motiejus/piqi-deb,Motiejus/piqi-deb,Motiejus/piqi-deb,Motiejus/piqi-deb,alavrik/piqi