Update README for debug extension

Add new debug extension

Fix .hgignore

Warn when output file not writeable

Rewrite '-' to '_' in Option command

minify: Add debug level, add warnings when specified level not valid, don't override options with defaults

Map print() to print_verbose()

Allow user or squishy file to specify custom shebang

minify: Break into minify_file and minify_string to allow easier re-use

compile: Compile the correct data (fixes a traceback if there is a shebang in the input)

Complain if output file not specified, or if squish would generate an empty file

Make Message and Error commands obey user's verbosity options

Support for Message and Error in squishy files to show messages to the user, and Exit to halt squishing

Add support for virtual IO in dofile and loadfile

Fix to work with modules which call module(...)

Add io.lines support for the virtual io

(0) -16 +16 tip

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