tree restriction in summary functions

[tnagler]

The summary function does some computations for each pair copulas. For large models, this may take a long time to run. In such cases it can be very useful to focus on some small range of trees.

[codecov-commenter]

Codecov Report

Merging #244 (5c5b67d) into dev (6a9e938) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #244   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          16       16           
  Lines        1558     1558           
=======================================
  Hits         1472     1472           
  Misses         86       86           

Impacted Files	Coverage Δ
R/vine_methods.R	91.66% <100.00%> (ø)
R/vinecop_methods.R	100.00% <100.00%> (ø)

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