lambert azimuthal proj seem to ignore user custom parameters

[doutriaux1]

reported by @lee1043

import vcs
import cdms2
f=cdms2.open(vcs.sample_data+"/clt.nc")
s=f("clt",slice(0,1))
x=vcs.init()
p=x.createprojection()
p.type="lambert azimuthal"
gm=x.createboxfill()
gm.projection=p
x.plot(s2,gm)

gives:

manipulating the parameters on projection do not seem to change anything:

p.centerlongitude=0
#or
p.centerlongitude=45

[danlipsa]

We fixed this but there is an issue remaining.
CDAT/vcs#181