User-visible changes.

Since 0.6.0 (2006-06-12)
========================
Features
--------
* coverage/callsite data from multiple runs can be aggregated (--aggregate) 

Bugfixes
--------
* the SCRIPT_LINES__ workaround works better
* fixed silly bug in coverage data acquisition (line after the correct one
  marked in some situations)
* avoid problems with repeated path separators in default ignore list, based
  on rbconfig's data


Minor enhancements
------------------

Since 0.5.0 (2006-05-30)
========================
Features
--------
* differential coverage report: --text-coverage-diff (-D) and --save
  Tells you when you've added new code that was not covered by the tests and
  when code that used to be covered isn't anymore. Integration with vim
  (contributions for other editors/IDEs welcome).
* fully cross-referenced reports, indicating where methods are called from
  and which methods were called for each line (--xrefs)
* cross-referenced report generation is now over 4 times faster for
  applications with deep call stacks (such as Rails apps)

Bugfixes
--------
* comments at EOF are marked now
* better handling of multiline hashes/arrays
* better handling of end/}: support chained method calls and more expressions
  on the same line
* better handling of heredocs with interpolation

Minor enhancements
------------------
* more readable --text-coverage
* set whether comments are "run" by default instead of attaching them to
  the following block of code (--[no-]comments)
* --report-cov-bug can be used to report bugs in the coverage analysis 

Since 0.4.0 (2006-05-22)
========================
Features
--------
* ability to create cross-referenced reports, indicating where methods are
  called from (--callsites)
* more refinements in the heuristics: now several kinds of multi-line quoted
  strings are handled properly
* --include-file to specify files not to be ignored in the report(s)
* implemented a task generator for Rant

Bugfixes
--------
* corrected the LOC counts in the XHTML summaries
* pure-Ruby tracing module works again; was broken in 0.4.0
* RcovTask#ruby_opts fixed; they were being passed to rcov instead of ruby
* solved the DOCTYPE issue (it'd get put at the end of the file under some
  Ruby versions)

Minor enhancements
------------------
* slightly more readable XHTML reports, esp. for IE
* text reports fit in 79 columns so they look OK with cmd.exe
* try to guide the user when all files were considered "uninteresting" by rcov
* the output_dir is preserved in RcovTasks when the user specifies --profile
  via the RCOVOPTS env. var.

Since 0.3.0 (2006-05-05)
========================

Features
--------
* easy automation via Rake using the bundled Rcov::RcovTask
* better heuristics: supports heredocs at last, including variants your editor
  is probably unable to handle, and =begin/=end comments
* --rails option to ignore files under vendor/, enviroment/ and config/
* parts of the runtime exposed and documented for external use
* new color scheme, with alternating shades of the base colors
* -w to set $VERBOSE=true (turns on warnings)
* --text-report and --text-summary
* --sort and --sort-reverse for the summaries and reports
* --threshold and --only-uncovered
* --replace-progname

Backwards incompatible changes
------------------------------
* renamed --text to --text-counts and --rich-text to --text-coverage: they
  were misnamed to begin with
* changed the meaning of -t and -T (--text-summary and --text-report)
* $0 is not changed by default for each loaded file anymore; the old 
  behavior (modulo a small bugfix) can be reproduced with --replace-progname

Since 0.2.0 (2006-02-25)
========================

Features
--------
* --exclude-only
* consolidate multiple references to the same underlying .rb file
  (much needed for Rails)
* --test-unit-only

Fixes
-----
* consider and/op operators
* honor --no-color in (rich) text mode 
* output valid XHTML indices

Since 0.1.0
===========
Tons. Better output, MUCH faster (two orders of magnitude), better command
line...