Alchemisery Release 5

This release includes several quality-of-life improvements, major bug fixes that affected different solutions/storylines, and minor bug/typo fixes.

• bug fixes for main puzzle
  
• bug fixes for side puzzles to help NPCs
• `go to <room name>` will now work in a number of locations, for example "go to laboratory", assuming you are adjacent to that room.
• `go out` will work in many indoors locations
• added `about`/`help` command for newcomers
  
• added `credits`
• improved several room and object descriptions
• changed some item names to make it easier to distinguish similar objects
• added more hints to descriptions
• `fill` command now works with ingredients in the reverse way that `pour` works
  • example: "fill alembic with aqua vitae" is the same as "pour aqua vitae into alembic"
• fixed some bugs with original pour command

I expect releases to slow after this one, and of course please comment if you see any problems.