Explicitly fail on non-rectangular tiles in WSG84

[agrenott]

Internal processing expect tiles to be rectangles aligned to WSG84 coordinates. Detect and fail on non-compatible tiles.

Close #51

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.11% (target: -1.00%)	:white_check_mark: 93.33%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (836e36585ba78fe861d81351b9249d2d2e983f4f) | 2156 | 1608 | 74.58% | | | Head commit (f21427880edf4cc110ef1a9e3386f8330035801d) | 2165 (+9) | 1617 (+9) | 74.69% (**+0.11%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#54) | 30 | 28 | **93.33%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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