2.0.2.post1

A patch release including hot-fixes and some relevant improvements inteded for the reliability
of the new API.
The most relevant advance is the new :math:`B_0` fieldmap unwarping object which is compatible
with *NiTranforms* and evades the problem of fiddling with the target image's x-forms.

* FIX: Make sure the VSM is not modified when accessing it (#207)
* FIX: Normalize phase-encoding polarity of coefficients after TOPUP (#202)
* FIX: Revise generation of the displacements field from coefficients (#199)
* FIX: Inconsistency left after renaming inputs to SDC-SyN (removing "BOLD") (#182)
* FIX: Correctly interpolate the BIDS root when datasets have sessions (#180)
* ENH: :math:`B_0` fieldmap unwarping object (#204)
* ENH: Add estimation method description to outputs (#191)
* ENH: Ensure a function node is covered with unit tests (#188)
* ENH: Add a preprocessing pipeline for SDC-SyN (#184)
* ENH: [rodents] Add input to override default B-Spline distances in INU correction with N4 (#178)
* ENH: Adopt new brain extraction algorithm in magnitude preparation workflow (#176)
* DOC: Fix typos as per codespell (#205)
* MAINT: Double-check conversion from TOPUP to standardized fieldmaps (#200)
* MAINT: Divide ambiguous debug parameter into smaller, more focused parameters (#190)
* MAINT: Adapt to GitHub actions' upgrade to Ubuntu 20.04 (#185)