Go HEP release 0.13.0

Release v0.13.0 is fresh from the oven.

This release ships with major improvements in the xrootd implementation and a few fixes in rootio.

rootio

leveraging the work that happened in xrootd, rootio is now able to read files over [x]root:

import (
    "go-hep.org/x/hep/rootio"
)

func foo() {
    f, err := rootio.Open("root://ccxrootdgotest.in2p3.fr:9001/tmp/rootio/testdata/small-flat-tree.root")
    if err != nil { ... }
    defer f.Close()
}

all the root-xyz commands can now also leverage xrootd:

$> root-ls -t root://ccxrootdgotest.in2p3.fr:9001/tmp/rootio/testdata/small-flat-tree.root
=== [root://ccxrootdgotest.in2p3.fr:9001/tmp/rootio/testdata/small-flat-tree.root] ===
version: 60806
TTree          tree                 my tree title (entries=100)
│ Int32        "Int32/I"            TBranch
│ Int64        "Int64/L"            TBranch
│ UInt32       "UInt32/i"           TBranch
│ UInt64       "UInt64/l"           TBranch
│ Float32      "Float32/F"          TBranch
│ Float64      "Float64/D"          TBranch
│ Str          "Str/C"              TBranch
│ ArrayInt32   "ArrayInt32[10]/I"   TBranch
│ ArrayInt64   "ArrayInt64[10]/L"   TBranch
│ ArrayUInt32  "ArrayInt32[10]/i"   TBranch
│ ArrayUInt64  "ArrayInt64[10]/l"   TBranch
│ ArrayFloat32 "ArrayFloat32[10]/F" TBranch
│ ArrayFloat64 "ArrayFloat64[10]/D" TBranch
│ N            "N/I"                TBranch
│ SliceInt32   "SliceInt32[N]/I"    TBranch
│ SliceInt64   "SliceInt64[N]/L"    TBranch
│ SliceUInt32  "SliceInt32[N]/i"    TBranch
│ SliceUInt64  "SliceInt64[N]/l"    TBranch
│ SliceFloat32 "SliceFloat32[N]/F"  TBranch
│ SliceFloat64 "SliceFloat64[N]/D"  TBranch

support for seeking (i.e.: event random access) has been added to scanners connected to chains of rootio.Trees,
rootio can now automatically generate streamers for std::vector<T> when a streamer for T exists,
rootio has been updated to v2 of pierrec/lz4 library to decode LZ4 compressed ROOT files.

xrootd

support for ping and protocol requests
support for dirlist, open, close and sync requests
support for read and write requests
support for rm, rmdir and truncate requests
support for stat, vstat, statx, mkdir, mv and chmod requests
support for signing requests
support for auth+unix request
introduction of the xrd-cp command to copy files from a remote xrootd server:

$> go doc go-hep.org/x/hep/xrootd/cmd/xrd-cp
Command xrd-cp copies files and directories from a remote xrootd server to
local storage.

Usage:

    $> xrd-cp [OPTIONS] <src-1> [<src-2> [...]] <dst>

Example:

    $> xrd-cp root://server.example.com/some/file1.txt .
    $> xrd-cp root://gopher@server.example.com/some/file1.txt .
    $> xrd-cp root://server.example.com/some/file1.txt foo.txt
    $> xrd-cp root://server.example.com/some/file1.txt - > foo.txt
    $> xrd-cp -r root://server.example.com/some/dir .
    $> xrd-cp -r root://server.example.com/some/dir outdir

Options:

    -r	copy directories recursively
    -v	enable verbose mode

introduction of the xrd-ls command to list the contents of directories on a remote xrootd server:

$> go doc go-hep.org/x/hep/xrootd/cmd/xrd-ls
Command xrd-ls lists directory contents on a remote xrootd server.

Usage:

    $> xrd-ls [OPTIONS] <dir-1> [<dir-2> [...]]

Example:

    $> xrd-ls root://server.example.com/some/dir
    $> xrd-ls -l root://server.example.com/some/dir
    $> xrd-ls -R root://server.example.com/some/dir
    $> xrd-ls -l -R root://server.example.com/some/dir

Options:

    -R	list subdirectories recursively
    -l	use a long listing format

a convenience xrootd/xrdfs.FileSystem interface has been introduced to model interacting with the remote xrootd server’s filesystem, following the os package API
a convenience xrootd/xrdfs.File interface has been introduced to model interacting with the remote xrootd file, following the os.File API
a convenience xrootd/xrdio.File type, implementing various io.Xyz interfaces has been introduced as well.