Descriptions in areas.yaml need cleanup

[gerritholl]

Describe the bug

Many descriptions of areas defined in areas.yaml are incorrect. They appear copy-pasted from other descriptions.

To Reproduce

Some examples:

satpy/satpy/etc/areas.yaml

Lines 129 to 140 in b8bd9ab

	worldeqc30km:
	description: World in 3km, platecarree
	projection:
	proj: eqc
	ellps: WGS84
	shape:
	height: 410
	width: 820
	area_extent:
	lower_left_xy: [-20037508.3428, -10018754.1714]
	upper_right_xy: [20037508.3428, 10018754.1714]
	units: m

(this is not the world in 3 km, and it cannot be 3 km worldwide if it's plate caree)

satpy/satpy/etc/areas.yaml

Lines 239 to 253 in b8bd9ab

	phil:
	description: kuwait area
	projection:
	proj: merc
	lat_0: 10.0
	lat_ts: 10.0
	lon_0: 125.0
	ellps: WGS84
	shape:
	height: 2048
	width: 4096
	area_extent:
	lower_left_xy: [-2200000.0, 0.0]
	upper_right_xy: [2200000.0, 2200000.0]
	units: m

(not Kuwait!)

satpy/satpy/etc/areas.yaml

Lines 510 to 523 in b8bd9ab

	euro1:
	description: Euro 4km area - Europe
	projection:
	proj: stere
	ellps: bessel
	lat_0: 90.0
	lon_0: 14.0
	lat_ts: 60.0
	shape:
	height: 4096
	width: 4096
	area_extent:
	lower_left_xy: [-2717181.7304994687, -5571048.14031214]
	upper_right_xy: [1378818.2695005313, -1475048.1403121399]

(not at 4 km)

satpy/satpy/etc/areas.yaml

Lines 1093 to 1106 in b8bd9ab

	euroasia_10km:
	description: Euroasia - Global 1km USGS Landuse database
	projection:
	proj: laea
	a: 6370997.0
	b: 6370997.0
	lat_0: 55.0
	lon_0: 20.0
	shape:
	height: 1300
	width: 1300
	area_extent:
	lower_left_xy: [-3000000.0, -4999000.0]
	upper_right_xy: [9999000.0, 8000000.0]

(1 km or 10 km?)

There are several others.

Expected behavior

I expect that descriptions are accurate and useful.

Actual results

Actual descriptions are sometimes accurate, sometimes inaccurate. Sometimes useful, sometimes not useful.

[gerritholl]

(And another thing: the names of eurol and euro1 are terribly similar in many fonts, but that would be impossible to fix without breaking backward compatibility.)