Fixed bugs:

• Issue #200: -Ewarn doesn't show any warning
• Issue #201: read-directory returns invalid string if the directory contains Japanese filename.
• (text sql) didn't handle DISTINCT SQL keyword correctly
• Experimental C translator emitted incorrect dependency
• (net rss) raised an error if empty tag was given for simple values
• (text sql) couldn't serialise chain identifier in order-by and group-by

New feature:

• force accepts non promise object.
• change-file-mode is now actual implementation on Windows environment It can only set readonly flag for now

Improvements:

• hashtable-entities is now implemented in C

Incompatible change:

• Issue #202: File operation failure should raise &i/o instead of &assersion