Shorthand layout of text objects
USAGE: h=ltext(x,y,s,flags[,parameter-value-pairs])
flags is a string of one character layout options for the text object.
Valid options are:
n: normalized-units
c: center horizontal alignment
r: right horizontal alignment
l: left horizontal alignment
t: top vertical alignment
b: bottom vertical alignment
m: middle vertical alignment

EXAMPLE:
ltext(1,1,'Text in top left corner','nrt')

-----
Aslak Grinsted 2014