[Proj] Differences across v4.8 and v4.9

[Joaquim Luis]

Hi,

I have found these differences between proj.4 versions that I don't find  
any documentation referring them. There is one FAQ  
http://proj4.org/faq.html#why-do-i-get-different-results-with-4-5-0-and-4-6-0  
entry but is about differences between 4.5.0 and 4.6.0, whilst this is  
between 4.8 and 4.9.

The first one (between A1 and B1) is specially more troublesome because is  
the example provide in the cs2cs doc page  
(http://proj4.org/apps/cs2cs.html) that agrees with 4.8.0 and not with  
4.9.2

Joaquim

proj
Rel. 4.8.0, 6 March 2012

A1
echo 45.25919444444 -111.5 | cs2cs +proj=latlong +datum=NAD83 +to  
+proj=utm +zone=10  +datum=NAD27 -r
1402285.99      5076292.42 -0.00

A2
echo 4.897 52.371 | proj +proj=aeqd +ellps=WGS84 +units=m
384923.72       5809986.50

A3
echo 4.897 52.371 | proj +proj=robin +ellps=WGS84 +units=m
394576.51       5571243.64

-------------------------------------------------------------------------------
proj
Rel. 4.9.3, dd Month yyyy

B1
echo 45.25919444444 -111.5 | cs2cs +proj=latlong +datum=NAD83 +to  
+proj=utm +zone=10  +datum=NAD27 -r
1402292.27      5076292.65 -0.00

B2
echo 4.897 52.371 | proj +proj=aeqd +ellps=WGS84 +units=m
384537.46       5809944.81

B3
echo 4.897 52.371 | proj +proj=robin +ellps=WGS84 +units=m
394576.53       5570940.84