Airways parsing no. 2

[globin]

supersedes #16, see discussion there for further.

Code Metrics Report

	main (c8a6b0b)	#21 (3139a10)	+/-
Coverage	76.4%	76.6%	+0.2%
Test Execution Time	1m46s	1m51s	+5s

Details

  |                     | main (c8a6b0b) | #21 (3139a10) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          76.4% |         76.6% | +0.2% |
  |   Files             |             11 |            11 |     0 |
  |   Lines             |            928 |           961 |   +33 |
+ |   Covered           |            709 |           736 |   +27 |
- | Test Execution Time |          1m46s |         1m51s |   +5s |

Code coverage of files in pull request scope (60.2% → 61.9%)

Files	Coverage	+/-
src/lib.rs	70.0%	+1.6%
src/sct.rs	88.3%	-1.4%
src/topsky/map/mod.rs	34.8%	0.0%

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Reported by octocov