Include all indexes in phonological groups when there is more than one metaplasm

[omare13]

When having metaplasms for consecutive grammatical syllables, there is no information in the metrical syllable to know which ones have been applied.

EXAMPLE:
line: "de oír de..."
gram_syll: "de|o|ir|de|..."
met_syll: "deoir|de|..."

CURRENT RANTANPLAN OUTPUT FOR gram_syll:
[
{
'content': 'de',
'has_synalepha': True,
},
{
'content': 'o',
'has_synalepha': False,
'has_sinaeresis': True,
'is_stressed': False
},
{
'content': 'ír',
'has_synalepha': False,
'has_sinaeresis': False,
},
{
'content': 'de',
's_number': 3,
'has_synalepha': False,
'has_sinaeresis': False,
}

CURRENT RANTANPLAN OUTPUT FOR met_syll:
[
{
'syllable': 'deoír',
'is_stressed': True,
'synalepha_index': [1],
'is_word_end': True
},
{
'syllable': 'de',
'is_stressed': False,
'is_word_end': True
},

EXPECTED RANTANPLAN OUTPUT FOR met_syll:
{
'syllable': 'deoír',
'is_stressed': True,
'synalepha_index': [1],
'sinaeresis_index':[2],
'is_word_end': True
},