Review composite

See merge request !8

Add area weighted average function.

See merge request !7

update zxc with master (delete tmp2.md)

small change to run.r

See merge request !6

Form adjustment for mon_mean.r and run.r

See merge request !5

delete tmp2.md

See merge request !4

small change to read_netcdf.r

See merge request !3

merge by command

fix

test

See merge request !2

test

Add 3 files about monthly mean

See merge request !1