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Fix numpy type alias deprecations

See merge request !26

* Since numpy 1.20 aliases for built in types have been
deprecated (see
https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations)
* This commit fixes the type aliases to use builtin Python types instead.

Cut 0.5 release

See merge request !25

Add minimal acquisitions module

See merge request !22

Adjust interpolation method in azimuth_performance

See merge request !24

ScanSAR implementation

See merge request !23

ScanSAR implementation for AASR, NESZ and RASR. RASR is untested and could be broken.

Moved some code common to AASR, NESZ and RAST to sar_performance_common.py.

Encapsulated preparation of rx_ant and tx_ant to dedicated functions.

- Added mode dependent amplitude tapering (raised cosine)
- Possibility for receive phase tapering as swath dependent vector, like for transmit.

- Fixed calculation of antenna gain in presence of tapering.

* The acquisitions module can be used to find the viewing geometry over
a region of interest for a particular orbit.

Add no-drama functions to develop

See merge request !21

Flat-earth phase computation

See merge request !19

Bump to version 0.4

See merge request !20

# Conflicts:
#   setup.cfg

* Add methods to calculate the temporal lag between the two on-board
receivers using the spectral support method.

Update derived_geo.py

See merge request !18

* We were forgetting to multiply by 2π/c₀

No,
"""
type
    Description of returned object.
""""
is not a sufficient description of what a method returns.

Added computation of ATI lag, spectral shift and dkz for a Harmony-like along-track antenna separation.

Bump to version 0.3

See merge request !17

* Change minimum Python version to 3.9

Update main branch with BistaticRadarGeometry changes

See merge request !16

Update derived_geo.py

See merge request !15

Fixed sign of companion delay so that a positive delay puts the companion behind the reference satellite.

A bit of docstrings to document spectral support functions.