Change require_right_margin default and update warning message

[camposandro]

Changes the crossmatch require_right_margin argument to be False, by default. It also updates the warning messages issued when the right catalog does not have a margin. Closes #296 and #297.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.05%. Comparing base (2b102a3) to head (7c749bf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #307   +/-   ##
=======================================
  Coverage   99.05%   99.05%           
=======================================
  Files          41       41           
  Lines        1274     1274           
=======================================
  Hits         1262     1262           
  Misses         12       12           

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[github-actions]

Before [2b102a3]	After [0d5e3c0]	Ratio	Benchmark (Parameter)
499±4ms	504±2ms	1.01	benchmarks.time_create_midsize_catalog
3.26±0.01s	3.26±0.01s	1	benchmarks.time_create_large_catalog
6.48±0.4ms	6.42±0.3ms	0.99	benchmarks.time_box_filter_on_partition
36.5±0.4ms	36.1±0.5ms	0.99	benchmarks.time_kdtree_crossmatch
13.0±0.9ms	12.8±0.3ms	0.98	benchmarks.time_polygon_search

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