fixed write_FVCOM_obs_TS.m
Merge pull request #4 from cliu3/master

fixed write_FVCOM_obs_TS.m

Merge pull request to fix variable names and dimension orders in write_FVCOM_obs_TS.m.
Merge branch 'master' of github.com:pwcazenave/fvcom-toolbox into dev
Fix handling of the optional vString argument.