Bump version to 0.44.0

[glwagner]

To be merged once #1093 and #1099 are in.

Release notes:

• Adds support for "picking up" a simulation from a checkpoint via the keyword pickup=true, pickup=checkpoint_iteration::Int and pickup=checkpont_filepath::String in run!(simulation) (New checkpointer features: set! and simulation "pickup" #1082)

• Adds a function set!(model, checkpoint_filepath) for "setting" a model state to the state recorded in a checkpoint file (New checkpointer features: set! and simulation "pickup" #1082)

• Adds support for "field-dependent" boundary conditions similar to field-dependent forcing terms (Field-dependent boundary conditions #1093)

• Beautifies and cleans up many of the examples, including getting them to build faster on Travis (Beautify the examples #1099)

[codecov]

Codecov Report

Merging #1103 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1103   +/-   ##
=======================================
  Coverage   57.16%   57.16%           
=======================================
  Files         161      161           
  Lines        3838     3838           
=======================================
  Hits         2194     2194           
  Misses       1644     1644           

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