support multiple sessions within accession

[yarikoptic]

ATM reproin would fail to convert the same study group if has multiple sessions in it. But may be we should support it (unless analysis of the logic would say that it is impossible). Usecase:

bids@rolando:/inbox/BIDS/Wager/Wager/1076_spacetop$ ls -l /inbox/DICOM/2022/*/*/A004310 total 419
drwxr-x--- 2 root wagerlab  130 Jan  5 23:25 001-anat-scout_ses-11
drwxr-x--- 2 root wagerlab    7 Jan  5 23:25 002-anat-scout_ses-11_MPR_sag
drwxr-x--- 2 root wagerlab    5 Jan  5 23:25 003-anat-scout_ses-11_MPR_cor
drwxr-x--- 2 root wagerlab    5 Jan  5 23:25 004-anat-scout_ses-11_MPR_tra
drwxr-x--- 2 root wagerlab    4 Jan  5 23:26 005-fmap-epi_dir-ap_acq-mb8
drwxr-x--- 2 root wagerlab    4 Jan  5 23:27 006-fmap-epi_dir-pa_acq-mb8
drwxr-x--- 2 root wagerlab    3 Jan  5 23:38 007-func_run-01_task-bodymapST1_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  5 23:38 008-func_run-01_task-bodymapST1_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  5 23:49 009-func_run-02_task-bodymapST1_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  5 23:50 010-func_run-02_task-bodymapST1_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 00:03 011-func_run-03_task-bodymapST1_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  6 00:03 012-func_run-03_task-bodymapST1_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 00:14 013-func_run-04_task-bodymapST1_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  6 00:14 014-func_run-04_task-bodymapST1_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 00:22 015-func_run-05_task-pinel-localizer_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab  702 Jan  6 00:22 016-func_run-05_task-pinel-localizer_acq-ap-mb8
drwxr-x--- 2 root wagerlab  226 Jan  6 00:29 017-anat-T1w_run-01_acq-MPRAGEXp3X08mm
drwxr-x--- 2 root wagerlab  226 Jan  6 00:33 018-anat-T1w_run-02_acq-MPRAGEXp3X08mm
drwxr-x--- 2 root wagerlab  130 Jan  6 00:51 019-anat-scout_ses-12
drwxr-x--- 2 root wagerlab    7 Jan  6 00:51 020-anat-scout_ses-12_MPR_sag
drwxr-x--- 2 root wagerlab    5 Jan  6 00:51 021-anat-scout_ses-12_MPR_cor
drwxr-x--- 2 root wagerlab    5 Jan  6 00:51 022-anat-scout_ses-12_MPR_tra
drwxr-x--- 2 root wagerlab    4 Jan  6 00:52 023-fmap-epi_dir-ap_acq-mb8
drwxr-x--- 2 root wagerlab    4 Jan  6 00:52 024-fmap-epi_dir-pa_acq-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 01:02 025-func_run-01_task-bodymapST2_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  6 01:02 026-func_run-01_task-bodymapST2_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 01:13 027-func_run-02_task-bodymapST2_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  6 01:13 028-func_run-02_task-bodymapST2_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 01:24 029-func_run-03_task-bodymapST2_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  6 01:24 030-func_run-03_task-bodymapST2_acq-ap-mb8
drwxr-x--- 2 root wagerlab    3 Jan  6 01:36 031-func_run-04_task-bodymapST2_acq-ap-mb8_SBRef
drwxr-x--- 2 root wagerlab 1162 Jan  6 01:36 032-func_run-04_task-bodymapST2_acq-ap-mb8