Relicense the Eclipse plugin under the EPL

Relicense the Eclipse plugin under the EPL

Acknowledgement of license change was made by the authors on
2007-10-10 by email with the subject "egit/jgit license switch to EPL"

>From: David Watson <dwatson@mimvista.com>
>I don't have a problem with this.

>From: Jing Xue <jingxue@digizenstudio.com>
>Fine by me. You can put my one line patch into public domain if
>that'll help getting more people to use [e]git.  8-)

>From: Ben Konrath <bkonrath@redhat.com>
>The license change is fine by me.

Also confirmed by Roger Soares on 2008-06-08 in a private mail
>From: "Roger C. Soares" <rogersoares@intelinet.com.br>
>Yep, it is ok with me.

Other contributors were not asked because they were either trivial
contributions, the code was already EPL, or their contributions are
not part of the code base anymore.

Confirmed-by: Dave Watson <dwatson@mimvista.com>
Confirmed-by: Shawn O. Pearce <spearce@spearce.org>
Confirmed-by: Roger C. Soares <rogersoares@intelinet.com.br>
Signed-off-by: Robin Rosenberg <robin.rosenburg@dewire.com>
This is the script used to change update license in all .java
files.

    open(F, '-|','git','ls-files');
    while (<F>) {
    	chop;
    	next unless m,^org.spearce.egit(\.\w+)*/,;
    	next unless m,\.java$,;

    	my $old_file = $_;
    	my $new_file = "$old_file.license.$$";
    	my $header = '';
    	my $package = '';

    	open(I,'<',$old_file);
    	while (<I>) {
    		if (/^package /) {
    			$package = $_;
    			last;
    		}

    		$header .= $_;
    	}
    	die "$old_file has no package line.\n" unless $package;

    	if ($header =~ / - Redistributions of source code must retain/) {
    		close I;
    		next;
    	}

    	my $lineno = $.;
    	my $author_name;
    	my $author_email;
    	my %all_years;
    	my %author_years;

    	print "$old_file\n";
    	open(B,'-|','git','blame',
    		"-L$lineno,",
    		'-C','-C',
    		'--whitespace',
    		'-p',
    		$old_file);
    	while (<B>) {
    		chop;
    		if (/^author (.*)$/) {
    			$author_name = $1;
    			next;
    		}
    		if (/^author-mail (<.*>)$/) {
    			$author_email = $1;
    			next;
    		}
    		if (/^author-time (\d+)$/) {
    			my $year = (localtime($1))[5] + 1900;
    			$all_years{$year} = 1;
    			$author_years{"$author_name $author_email"}{$year} = 1;
    		}
    	}
    	close B;

    	open(O,'>',$new_file);
    	print O "/*******************************************************************************\n";

    	my %used_author;
    	foreach my $year (sort {$a cmp $b} keys %all_years) {
    		foreach my $who (sort keys %author_years) {
    			next if $used_author{$who}++;
    			my $y = (sort {$b cmp $a} keys %{$author_years{$who}})[0];
    			print O " * Copyright (C) $y, $who\n";
    		}
    	}

    	print O <<'EOF';
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * See LICENSE for the full license text, also available.
 *******************************************************************************/
EOF
	print O $package;
	print O while <I>;
	close I;
	close O;
	rename($new_file, $old_file);
}
close F;