press - pr: re-order the three man features to roles -> inout -> 2pc,

Log Message:
-----------
 re-order the three man features to roles -> inout -> 2pc, based on roles being something everyone will use, inout
beingsomething highly desirable for people migrating to pg from oracle/m$/firebird/etc... and 2pc being much more niche
thanthe other two (especially given the current xa contreversy). 

Modified Files:
--------------
    pr/releases/8.1/en:
        release.txt (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/press/pr/releases/8.1/en/release.txt.diff?r1=1.4&r2=1.5)