In revtool, reset the errorCode global array var before calling _lines.  Fixes a bug that Larry was experiencing in the 3par tree. 
In revtool, reset the errorCode global array var before calling _lines. 
Fixes a bug that Larry was experiencing in the 3par tree. 

bk: 3b6581447ImEHoiy5GA3zCdZN8ao6A
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper