ranghetti/sen2r: Version 0.3.4

Major improvements

• Implement 4 different processing orders in order to fasterize processing. See "processing_order" in sen2r() documentation. The 4 different modes allow to privilege stability, velocity or disk space. In this version, the legacy mode ("by_step") is maintained as the default.
• Add new function s2_rgb() to produce RGB images, integrating it in sen2r() and in the GUI.
• Add a dockerised version of sen2r: https://hub.docker.com/r/ranghetti/sen2r

• Change base cloud masks:
  • class "Saturated and defective" is masked within all masks;
  • class "Dark area pixels" is masked in masks in which "Cloud shadows" was masked;
  • mask "cloud_shadow_cirrus" was renamed to "clear_sky";
  • a new "land" mask was added.
• Add "nomask" level to s2_mask()
• Names of ratio indices now uses ":" instead of "/" (#123)
• Index TCI_idx now is TCIdx
• Use a default extent name (leaving it empty is now not allowed, in order not to confuse with naming convention of merged files)

• Improve SAFE filtering: removing duplicates; filtering by position (only the ones overlapping the extent); do not perform a double check of existing products in offline mode.
• Improve GUI: improve cloud mask helper (documentation within s2_gui() was improved by adding a modaldialog which explains how to apply buffer and smoothing to cloud masks)
• Allow sen2r working with GDAL 2.1.2
• Allow GDAL path to be specified in check_gdal()
• Implements a faster method for masking
• Add max_cloud_safe argument to sen2r()
• Add a function safe_isvalid() to check for valid SAFE archive names, and use it to filter existing SAFE folders (#104)
• Update installation documentation (Linux dependencies and Docker)

• Important fix: fix indices computation (before that, indices with additive values were wrongly generated).
• Avoid errors when a SAFE directory exists but not in the right format
• Fix the fiddly error which caused several blocks when startig s2_merge() or s2_calcindices()
• Fix searching oldname products with "auto" corr_type
• Fix loading a custom mask from json parameter file
• remove duplicated EVI2 index
• #112, #115, #120, #124, and others