This PD file contains the Imp portable environment split inot bits for
linking in a non sharing Unix environment. With shared environments the
single glob portenv02s is preferable. The modules are roughly
     1) Trig and maths fns
     2) The matrix functions and other historic material
     3) Language support   Read write substring etc
     4) Crude exponentiation support. The Fortarn versions are used
        after they have been booted
The include files are not inserted as yet