Merge pull request #946 from yashbhargava1992/fix_power_upper_limit

Fix power upper limit

Merge pull request #937 from StingraySoftware/use_timepixr_timedel

Use the timepixr keyword when calculating times

Merge pull request #933 from StingraySoftware/gti_corr

Gti corrected power spectrum for long, gappy observations

Alternative way to run tests

Merge pull request #876 from StingraySoftware/release_226

Create release 2.2.6

Merge pull request #868 from StingraySoftware/fix_build_instructions

Update building and testing instructions

Merge pull request #865 from StingraySoftware/fix_common_ref

Accounting for energy overlap in cross spectral products

Merge pull request #863 from StingraySoftware/add_obsid_info

Add obsid info

Merge pull request #829 from StingraySoftware/update_joss_paper

New JOSS paper draft

Merge pull request #853 from StingraySoftware/fix_header

Fix header