Compute approximated likelihoods based on 2-point estimation data.

The `cg2pt` command is invoked as either:

`cg2pt`*Options*`cg2pt`*Mode*

The `cg2pt` command allows fast likelihood computations based on 2-point estimation data when Mode is set to a value different from zero. Otherwise, exact multipoint likelihood computations are performed by the EM algorithm. The fast mode should be chosen with care because it does a poor approximation in the case of multiple datasets merged by order (`dsmergor`) and also when there are many missing data in the datasets.

*Options*:`-u`to obtain the synopsis of the normal use,`-h`to print a one line description,`-H`to print a short help.*Mode*: if set to 1, then enter in fast likelihood computation mode ; if set to 0, then enter in normal multipoint likelihood computation mode.

`paretolkh`(2.7.4)

Thomas Schiex 2009-10-27