Wrote up coverage tables for M0 and interest

IFS data
Lots of fussing with R today
Explains the regional distribution of coverage
Shows that only 33 countries have both M0 and interest.

Need Yan's data for euro zone countries M0 and interest earnings.
Merge branch 'master' of https://github.com/benmazzotta/ccglobal

Conflicts:
	markdown/Discuss_seigniorage.pdf