Add a gap filling algorithm

[stelmo]

Add a basic gap filling algorithm, basically the same one as used by cobrapy

[cylon-x]

🟥  Commit bf019df requires formatting!

Required formatting changes summary:

 src/reconstruction/gapfill.jl  | 27 +++++++++++++--------------
 test/reconstruction/gapfill.jl | 19 +++++++------------
 2 files changed, 20 insertions(+), 26 deletions(-)

[exaexa]

looks okay, I suggested a few minor improvements

[cylon-x]

🟢  Commit b43f909 is formatted properly.

[cylon-x]

🟢  Commit aa08208 is formatted properly.

[cylon-x]

🟢  Commit aa08208 is formatted properly.

[cylon-x]

🟥  Commit 4edb1b3 requires formatting!

Required formatting changes summary:

 src/reconstruction/gapfill_minimum_reactions.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

[cylon-x]

🟥  Commit f8cd84a requires formatting!

Required formatting changes summary:

 src/reconstruction/gapfill_minimum_reactions.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

[github-actions]

🟥  Commit 3a2be37 requires formatting!

Required formatting changes summary:

 src/base/types/wrappers/GeckoModel.jl | 4 ++--
 test/analysis/gecko.jl                | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

[cylon-x]

🟢  Commit 3a2be37 is formatted properly.

[github-actions]

🟥  Commit fa0dc91 requires formatting!

Required formatting changes summary:

 src/base/types/wrappers/GeckoModel.jl | 4 ++--
 test/analysis/gecko.jl                | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

[cylon-x]

🟢  Commit fa0dc91 is formatted properly.

[codecov]

Codecov Report

Merging #617 (fa0dc91) into develop (3cd91c2) will increase coverage by 0.01%.
The diff coverage is 91.66%.

@@             Coverage Diff             @@
##           develop     #617      +/-   ##
===========================================
+ Coverage    90.46%   90.47%   +0.01%     
===========================================
  Files           78       79       +1     
  Lines         1878     1922      +44     
===========================================
+ Hits          1699     1739      +40     
- Misses         179      183       +4     

Impacted Files	Coverage Δ
src/reconstruction/gapfill_minimum_reactions.jl	90.69% <90.69%> (ø)
src/base/solver.jl	96.42% <100.00%> (+0.13%)	⬆️

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