Subtract unique pointings

[aleberti]

This PR implements the subtraction of unique pointings. It checks the pointings provided via the file, and then it checks if there are repeated Ra-Dec pairs. In that case, unique pairs are computed, so that the number of subtracted pointings is correct.

[aleberti]

Behavior with the following pointings file:

#Time RA Dec
2025-03-26 01:15:53 276.08 51.42
2025-03-26 01:15:53 276.08 51.42
2025-03-26 00:25:01 267.632 54.7246
2025-03-26 00:45:01 271.35 52.8019
2025-03-26 01:05:01 276.959 53.9568
2025-03-26 01:25:01 276.954 48.9228
2025-03-26 01:45:01 281.796 51.643

and the command Tiling_Observations -skymap http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250313607/quicklook/glg_healpix_all_bn250313607.fit -time "2025-03-26 02:05:01" -o /home/mpp/Tests/tilepy -cfg /home/mpp/Software/grbcontroller/LSTTHController/conf/FollowupParameters_6_GBM.ini -eventName bn250313607 -tiles /home/mpp/Tests/tilepy/Pointings_observed_bn250313607.txt

Before the changes from this PR:

Subtracting pointings from /home/mpp/Tests/tilepy/Pointings_observed_bn250313607.txt
Coordinates ra: 276.08 dec: 51.42 Pgw: 0.3945193134958276 vs 0.3945193134958276
Coordinates ra: 276.08 dec: 51.42 Pgw: 0.0 vs 0.3945193134958276
Coordinates ra: 267.632 dec: 54.7246 Pgw: 0.04369796714430249 vs 0.04369796714430249
Coordinates ra: 271.35 dec: 52.8019 Pgw: 0.0771157338712796 vs 0.20112911648644355
Coordinates ra: 276.959 dec: 53.9568 Pgw: 0.10650235503152987 vs 0.30235965076738325
Coordinates ra: 276.954 dec: 48.9228 Pgw: 0.06439317765526986 vs 0.19635505967733863
Coordinates ra: 281.796 dec: 51.643 Pgw: 0.07159900890039808 vs 0.16515491355935172

After the changes from this PR:

Subtracting pointings from /home/mpp/Tests/tilepy/Pointings_observed_bn250313607.txt
Subtracting pointings from /home/mpp/Tests/tilepy/Pointings_observed_bn250313607.txt
Coordinates ra: 276.08 dec: 51.42 Pgw: 0.3945193134958276 vs 0.3945193134958276
Coordinates ra: 267.632 dec: 54.7246 Pgw: 0.04369796714430249 vs 0.04369796714430249
Coordinates ra: 271.35 dec: 52.8019 Pgw: 0.0771157338712796 vs 0.20112911648644355
Coordinates ra: 276.959 dec: 53.9568 Pgw: 0.10650235503152987 vs 0.30235965076738325
Coordinates ra: 276.954 dec: 48.9228 Pgw: 0.06439317765526986 vs 0.19635505967733863
Coordinates ra: 281.796 dec: 51.643 Pgw: 0.07159900890039808 vs 0.16515491355935172

[aleberti]

It closes #19

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