Commits for galt

v248_preview2 to v248_base (2011-03-01 to 2011-03-08) v248

• adding a comment when linesChanged==0 to explain to users about white-space only change creates empty diff
  • src/utils/git-reports/git-reports.c - lines changed 2, context: html, text, full: html, text
• minor change to bigWarnNumLines() to use an existing lib function
  • src/hg/hgTracks/bigWarn.c - lines changed 7, context: html, text, full: html, text