Minor updates

Minor documentation updates, plus fix for failing installation.

Minor patch

Minor changes to peaks arguments. Minor update to replace_tail no that n is not strictly necessary.

Minor patch

Minor changes to peaks arguments.

Two new functions: `peaks` and `smooth`

This release contains two new functions:

• smooth - a general data smoothign function ith several different smoothing methods
• peaks - a function for automatically detecting peaks and troughs in oscillating data

Initial relase

Just one function for now:

• progress()
  Simple progress bar function for use in loops etc.